I am very sorry to inform everyone on this list that I had a severe power problem with my Micro Desktop 1.7. I applied power to the DC Jack and the area right to the jack burned out. (see attached picture). One thing that I noticed today was that UART worked when the card was powered up whilst attached to USB OTG alone (DC Jack on MD not connected)! But according to the wiki this should not work at all because of the Y6280 current control IC set at 1A acting as a diode in this case. When I applied power only to the MD I noticed that UART output was complete garbage (random characters). I don't know if only sometimes or everytime. When on DC power, board in FEL-mode with no card and pressing '2', then connecting USB OTG and booting U-Boot sunxi over FEL everything worked flawlessly.
As I said I am very sorry that I screwed up. Luke, do you have any ideas what went wrong? Do you think this +also destroyed the computer card? If the error is on my side (embarassing but still the better +case) I will have to swallow the bitter pill that I screwed up badly. I am still going to cover the costs of computer card and MD so there will not be a financial loss to the project. I am very disappointed as I have made could progress. Had sunxi U-Boot, sunxi 3.4.104 kernel running and booting Debian Stretch rootfs...
On the other hand if this is a general problem better we know it now and can take the necessary steps.
Pablo
On Sun, Jul 26, 2020 at 10:33 AM Pablo Rath pablo@parobalth.org wrote:
I am very sorry to inform everyone on this list that I had a severe power problem with my Micro Desktop 1.7. I applied power to the DC Jack and the area right to the jack burned out. (see attached picture).
thank you for sending this to the list, as i asked, after you sent it initially privately. i had this happen to a 1.5 MD board 3 years ago, but no others, despite them running for prolonged periods of time.
what i noticed about that board was that the inductor was not properly soldered down. this would be insufficient contact, introduce resistance, and at that point the RT8288 would go unstable.
One thing that I noticed today was that UART worked when the card was powered up whilst attached to USB OTG alone (DC Jack on MD not connected)!
yes, i mentioned this already. the TX and RX line GPIO current is sufficient to "power" the LEDs and possibly the FT2322 IC as well.
But according to the wiki this should not work at all because of the Y6280 current control IC set at 1A acting as a diode in this case.
no: it's not being powered through the 5.0V rail: the LEDs on the USB-UART are being powered through the *processor*, through the TX and RX lines.
When I applied power only to the MD I noticed that UART output was complete garbage (random characters).
yes. i did say. you get GND loops that spike the USB-UART sufficiently to trigger the RX line.
I don't know if only sometimes or everytime. When on DC power, board in FEL-mode with no card and pressing '2', then connecting USB OTG and booting U-Boot sunxi over FEL everything worked flawlessly.
As I said I am very sorry that I screwed up. Luke, do you have any ideas what went wrong?
not in the slightest. or - maybe: have a look at the contact points where the inductor sits on the PCB. there should be quite a lot of solder, there.
Do you think this +also destroyed the computer card?
when it happened for me it did no damage. all i did was (because i didn't have any spares) find a USB2 back-to-back power cable (i may have made one by cutting a plug off a USB device and wiring it to a 5.0v supply), plug it into one of the USB2 ports and provided "direct" 5.0v power that way. you *need* a stable supply to do that (1.5 preferably 2.0 A) designed *specifically* for providing USB power. UNDER NO CIRCUMSTANCES plug the 12v PSU into the USB socket. and DO NOT use an "off-the-shelf generic 5.0v wall wart". use something SPECIFICALLY designed for providing USB power because it is (a) stable and (b) current-limited.
if you plug the Card directly into a socket (OTG, removed from the MicroDesktop) - not via a USB hub - "ls" should show the familiar USB ID for the A20.
If the error is on my side (embarassing but still the better +case) I will have to swallow the bitter pill that I screwed up badly. I am still going to cover the costs of computer card and MD so there will not be a financial loss to the project.
appreciated
I am very disappointed as I have made could progress. Had sunxi U-Boot, sunxi 3.4.104 kernel running and booting Debian Stretch rootfs...
great!
On the other hand if this is a general problem better we know it now and can take the necessary steps.
modifying the 1.7 MD PCB and going through *yet another* round of PCB development costs and time delays - this not something i want everyone to have to go through. particularly because they're already manufactured.
sigh.
l.
this is from the RT8288 datasheet. i think for a 1.8 MD this area will need rework. a rework of the VGA area is needed anyway.
l.
On Sun, Jul 26, 2020 at 10:54:27AM +0100, Luke Kenneth Casson Leighton wrote:
On Sun, Jul 26, 2020 at 10:33 AM Pablo Rath pablo@parobalth.org wrote:
I am very sorry to inform everyone on this list that I had a severe power problem with my Micro Desktop 1.7. I applied power to the DC Jack and the area right to the jack burned out. (see attached picture).
thank you for sending this to the list, as i asked, after you sent it initially privately. i had this happen to a 1.5 MD board 3 years ago, but no others, despite them running for prolonged periods of time.
what i noticed about that board was that the inductor was not properly soldered down. this would be insufficient contact, introduce resistance, and at that point the RT8288 would go unstable.
Ok. As you have probably deduced from my questions I am not really into hardware. Thank you for all your explanations and clarifications. I still try to wrap my head around what should work straight away, what could work with the right modifications and what can never work...
[...]
As I said I am very sorry that I screwed up. Luke, do you have any ideas what went wrong?
not in the slightest. or - maybe: have a look at the contact points where the inductor sits on the PCB. there should be quite a lot of solder, there.
Sorry for the dumb question but where can I find the inductor?
Do you think this +also destroyed the computer card?
when it happened for me it did no damage. all i did was (because i didn't have any spares) find a USB2 back-to-back power cable (i may have made one by cutting a plug off a USB device and wiring it to a 5.0v supply), plug it into one of the USB2 ports and provided "direct" 5.0v power that way. you *need* a stable supply to do that (1.5 preferably 2.0 A) designed *specifically* for providing USB power. UNDER NO CIRCUMSTANCES plug the 12v PSU into the USB socket. and DO NOT use an "off-the-shelf generic 5.0v wall wart". use something SPECIFICALLY designed for providing USB power because it is (a) stable and (b) current-limited.
I have a power supply from a Huawei Tablet (Output 5V, 2A) and one from an old Ipad Mini (Output 5V, 1A) both with a wall plug and a female USB socket. Can I use one of them with a standard USB 2.0 USB A to USB A (male to male) cable? The term 'back-to-back' power cable yielded limited search results in my case. Another option is an official PSU for the Raspberry Pi, 5V, 2A with wall plug and a non-detachable micro-usb cable. I can buy a micro-usb to USB A adapter if this is going to work. So I have to either buy a cable, an adapter or a whole new USB Power supply depending on your opinion.
if you plug the Card directly into a socket (OTG, removed from the MicroDesktop) - not via a USB hub - "ls" should show the familiar USB ID for the A20.
My initial thought today was: "NO, now everything is lost." so your reply made my day. Tested the Card standalone and 'sunxi-fel version' shows an Allwinner Device in FEL-Mode. Computer Card still alive!
Pablo
On Sunday, July 26, 2020, Pablo Rath pablo@parobalth.org wrote:
not in the slightest. or - maybe: have a look at the contact points where the inductor sits on the PCB. there should be quite a lot of solder, there.
Sorry for the dumb question but where can I find the inductor?
big square thing 10x10mm by about 5mm high with a round thing in the middle. metal thing on two sides, wire leading into the round thing.
inductors are electromagnets basically.
I have a power supply from a Huawei Tablet (Output 5V, 2A) and one from an old Ipad Mini (Output 5V, 1A) both with a wall plug and a female USB socket.
ok you need... a male to male cable.
Can I use one of them with a standard USB 2.0 USB A to USB A (male to male) cable?
yes that's the one. usually used on laptop fan bases.
if you plug the Card directly into a socket (OTG, removed from the MicroDesktop) - not via a USB hub - "ls" should show the familiar USB ID for the A20.
My initial thought today was: "NO, now everything is lost." so your reply made my day. Tested the Card standalone and 'sunxi-fel version' shows an Allwinner Device in FEL-Mode. Computer Card still alive!
hurrah. so yes just ignore the blown RT8288 entirely.
actually to get better power stability (no GND loops) you can plug the USBA-to-A cable into the same device as the USB-UART is going into.
one thing occurred to me is the possibility that the AC Mains hum combined with ground loops (through the USB UART into the laptop) may have been enough to overload the RT8288 just as the PSU was being plugged in.
given that this is going to be a fairly normal configuration (leaving the UART plugged into a laptop) i am not very happy.
l.
On Sun, Jul 26, 2020 at 10:29:07PM +0100, Luke Kenneth Casson Leighton wrote:
On Sunday, July 26, 2020, Pablo Rath pablo@parobalth.org wrote:
I have a power supply from a Huawei Tablet (Output 5V, 2A) and one from an old Ipad Mini (Output 5V, 1A) both with a wall plug and a female USB socket.
ok you need... a male to male cable.
Can I use one of them with a standard USB 2.0 USB A to USB A (male to male) cable?
yes that's the one. usually used on laptop fan bases.
Bought and tried the cable but I have no working UART. So far I have tried both USB-ports on the Micro Desktop, powering with the USB-port of my laptop and with the power supply (Output 5V, 2A). I think that the cable is working because it is new and it can load my smartphone (with an additional USB-OTG female USB to Micro USB adapter). Is there anything else I can try? It is frustrating. Without UART connection I don't know if anything happens at all when connecting the USB cable to the Micro Desktop.
Pablo
On Tue, Aug 11, 2020 at 10:07:14AM +0200, Pablo Rath wrote:
On Sun, Jul 26, 2020 at 10:29:07PM +0100, Luke Kenneth Casson Leighton wrote:
On Sunday, July 26, 2020, Pablo Rath pablo@parobalth.org wrote:
I have a power supply from a Huawei Tablet (Output 5V, 2A) and one from an old Ipad Mini (Output 5V, 1A) both with a wall plug and a female USB socket.
ok you need... a male to male cable.
Can I use one of them with a standard USB 2.0 USB A to USB A (male to male) cable?
yes that's the one. usually used on laptop fan bases.
Bought and tried the cable but I have no working UART. So far I have tried both USB-ports on the Micro Desktop, powering with the USB-port of my laptop and with the power supply (Output 5V, 2A). I think that the cable is working because it is new and it can load my smartphone (with an additional USB-OTG female USB to Micro USB adapter). Is there anything else I can try? It is frustrating. Without UART connection I don't know if anything happens at all when connecting the USB cable to the Micro Desktop.
Sorry, forgot to add that I tested my USB TTl to serial adapter with another arm-board and confirmed it working.
Pablo
11.08.2020, 11:32, "Pablo Rath" pablo@parobalth.org:
On Tue, Aug 11, 2020 at 10:07:14AM +0200, Pablo Rath wrote:
On Sun, Jul 26, 2020 at 10:29:07PM +0100, Luke Kenneth Casson Leighton wrote: > On Sunday, July 26, 2020, Pablo Rath pablo@parobalth.org wrote: > > > > > > I have a power supply from a Huawei Tablet (Output 5V, 2A) and one from > > an old Ipad Mini (Output 5V, 1A) both with a wall plug and a female USB > > socket. > > > ok you need... a male to male cable. > > > > Can I use one of them with a standard USB 2.0 USB A to USB A (male to > > male) cable? > > > yes that's the one. usually used on laptop fan bases. >
Bought and tried the cable but I have no working UART. So far I have tried both USB-ports on the Micro Desktop, powering with the USB-port of my laptop and with the power supply (Output 5V, 2A). I think that the cable is working because it is new and it can load my smartphone (with an additional USB-OTG female USB to Micro USB adapter). Is there anything else I can try? It is frustrating. Without UART connection I don't know if anything happens at all when connecting the USB cable to the Micro Desktop.
Sorry, forgot to add that I tested my USB TTl to serial adapter with another arm-board and confirmed it working.
Pablo
Hi! I have an EOMA board + microdesktop PCB that's currently set up to be power-able, and I can test things on a known-working board. Are you using some kind of SD card image that I could download for testing, or just the EOMA PCB + desktop card without any image-containing MicroSD card?
Cheers! Arsenijs
On Tuesday, August 11, 2020, Pičugins Arsenijs crimier@yandex.ru wrote:
Hi! I have an EOMA board + microdesktop PCB that's currently set up to be power-able, and I can test things on a known-working board. Are you using some kind of SD card image that I could download for testing, or just the EOMA PCB + desktop card without any image-containing MicroSD card?
he's got things built and documented it here: http://rhombus-tech.net/allwinner_a10/Building_Linux/
somewhere i have a .tgz of the first partition and early parts of the raw disk image. it *might* be here:
http://hands.com/~lkcl/eoma/a20/ http://lkcl.net/eoma68-a20
the operating system can be constructed with debootstrap of armhf foreign arch, which is very well documented on the debian wiki and many other places
https://wiki.debian.org/ArmHardFloatChroot
l.
On Tue, Aug 11, 2020 at 11:50:02AM +0100, Luke Kenneth Casson Leighton wrote:
On Tuesday, August 11, 2020, Pičugins Arsenijs crimier@yandex.ru wrote:
Hi! I have an EOMA board + microdesktop PCB that's currently set up to be power-able, and I can test things on a known-working board. Are you using some kind of SD card image that I could download for testing, or just the EOMA PCB + desktop card without any image-containing MicroSD card?
he's got things built and documented it here: http://rhombus-tech.net/allwinner_a10/Building_Linux/
Yes, and here (Currently a work in progress): http://rhombus-tech.net/allwinner/a20/EOMA68-A20_2-7-4_preproduction/
Pablo
Hi! I have an EOMA board + microdesktop PCB that's currently set up to be power-able, and I can test things on a known-working board. Are you using some kind of SD card image that I could download for testing, or just the EOMA PCB + desktop card without any image-containing MicroSD card?
Thank you for your offer to help. I have a known working SD card image but if I can't get UART to work I can't see early boot console output (U-Boot and Kernel) and can not contribute much at this stage of the project.
Pablo
On Tue, Aug 11, 2020 at 12:36:00PM +0300, Pičugins Arsenijs wrote: Hi! I have an EOMA board + microdesktop PCB that's currently set up to be power-able, and I can test things on a known-working board. Are you using some kind of SD card image that I could download for testing, or just the EOMA PCB + desktop card without any image-containing MicroSD card?
Hi Arsenijs, I might have a small testing task for you. Would help me a lot. Do you have a working UART connection (soldered pins to to the Micro Desktop) and 'sunxi-tools' installed?
Pablo
On Tuesday, August 11, 2020, Pablo Rath pablo@parobalth.org wrote:
On Sun, Jul 26, 2020 at 10:29:07PM +0100, Luke Kenneth Casson Leighton wrote:
On Sunday, July 26, 2020, Pablo Rath pablo@parobalth.org wrote:
I have a power supply from a Huawei Tablet (Output 5V, 2A) and one from an old Ipad Mini (Output 5V, 1A) both with a wall plug and a female USB socket.
ok you need... a male to male cable.
Can I use one of them with a standard USB 2.0 USB A to USB A (male to male) cable?
yes that's the one. usually used on laptop fan bases.
Bought and tried the cable but I have no working UART. So far I have tried both USB-ports on the Micro Desktop, powering with the USB-port of my laptop and with the power supply (Output 5V, 2A). I think that the cable is working because it is new and it can load my smartphone (with an additional USB-OTG female USB to Micro USB adapter). Is there anything else I can try? It is frustrating. Without UART connection I don't know if anything happens at all when connecting the USB cable to the Micro Desktop.
does the USB UART happen to be one which has flashing LEDs on it?
there is another way to power the Card: *carefully* plug in a USB-OTG cable.
however the SY6280 should prevent power getting back through to the Housing.
it will however not prevent the 3.3v Tx and Rx of the UART from lighting up.
if the SY6280 was damaged at the time then it will not be letting power through to the Card.
therefore powering via USB-OTG will bypass that.
l.
On Tue, Aug 11, 2020 at 11:37:41AM +0100, Luke Kenneth Casson Leighton wrote:
On Tuesday, August 11, 2020, Pablo Rath pablo@parobalth.org wrote:
On Sun, Jul 26, 2020 at 10:29:07PM +0100, Luke Kenneth Casson Leighton wrote:
On Sunday, July 26, 2020, Pablo Rath pablo@parobalth.org wrote:
I have a power supply from a Huawei Tablet (Output 5V, 2A) and one from an old Ipad Mini (Output 5V, 1A) both with a wall plug and a female USB socket.
ok you need... a male to male cable.
Can I use one of them with a standard USB 2.0 USB A to USB A (male to male) cable?
yes that's the one. usually used on laptop fan bases.
Bought and tried the cable but I have no working UART. So far I have tried both USB-ports on the Micro Desktop, powering with the USB-port of my laptop and with the power supply (Output 5V, 2A). I think that the cable is working because it is new and it can load my smartphone (with an additional USB-OTG female USB to Micro USB adapter). Is there anything else I can try? It is frustrating. Without UART connection I don't know if anything happens at all when connecting the USB cable to the Micro Desktop.
does the USB UART happen to be one which has flashing LEDs on it?
No. There are no LEDs on it.
there is another way to power the Card: *carefully* plug in a USB-OTG cable.
however the SY6280 should prevent power getting back through to the Housing.
it will however not prevent the 3.3v Tx and Rx of the UART from lighting up.
if the SY6280 was damaged at the time then it will not be letting power through to the Card.
therefore powering via USB-OTG will bypass that.
Ok. I have tried that now. Pressed "2" while applying power over USB-OTG but an Allwinner USB FEL device is not found with 'sunxi-fel version'. Also tried to boot with my known working µSD-Card but there is no output on UART.
Pablo
On Tue, Aug 11, 2020 at 12:35 PM Pablo Rath pablo@parobalth.org wrote:
On Tue, Aug 11, 2020 at 11:37:41AM +0100, Luke Kenneth Casson Leighton wrote:
Ok. I have tried that now. Pressed "2" while applying power over USB-OTG but an Allwinner USB FEL device is not found with 'sunxi-fel version'. Also tried to boot with my known working µSD-Card but there is no output on UART.
hm ok there is one more "trick" - actually uploading (and executing) the spl bootloader followed by u-boot and everything else https://linux-sunxi.org/FEL/USBBoot#Boot_the_system_over_USB
the old version, fel-boot, you had to first "run" then "execute". the newer version (sunxi-fel) looks like it does run-and-execute.
the first binary (the spl bootloader) fits into the 16k SRAM and until that's executed (and it initialises the PLL and DDR3) there's flat-out no chance of uploading anything at all into the upper areas of memory (0x42000000) which are in the DDR3 RAM area.
i have in the past set up a linux kernel to convert the USB-OTG into a usbserial "gadget", and also a usbnet-compatible g_ether "gadget". the first way was successful in showing early console logs, and the second was enough to get a USB eth0 that i could ssh in over.
l.
On Tue, Aug 11, 2020 at 12:47:51PM +0100, Luke Kenneth Casson Leighton wrote:
On Tue, Aug 11, 2020 at 12:35 PM Pablo Rath pablo@parobalth.org wrote:
On Tue, Aug 11, 2020 at 11:37:41AM +0100, Luke Kenneth Casson Leighton wrote:
Ok. I have tried that now. Pressed "2" while applying power over USB-OTG but an Allwinner USB FEL device is not found with 'sunxi-fel version'. Also tried to boot with my known working µSD-Card but there is no output on UART.
hm ok there is one more "trick" - actually uploading (and executing) the spl bootloader followed by u-boot and everything else https://linux-sunxi.org/FEL/USBBoot#Boot_the_system_over_USB
the old version, fel-boot, you had to first "run" then "execute". the newer version (sunxi-fel) looks like it does run-and-execute.
the first binary (the spl bootloader) fits into the 16k SRAM and until that's executed (and it initialises the PLL and DDR3) there's flat-out no chance of uploading anything at all into the upper areas of memory (0x42000000) which are in the DDR3 RAM area.
i have in the past set up a linux kernel to convert the USB-OTG into a usbserial "gadget", and also a usbnet-compatible g_ether "gadget". the first way was successful in showing early console logs, and the second was enough to get a USB eth0 that i could ssh in over.
So just to make sure, your advice now is to work with the standalone Computer Card and get usbserial or g_ether "gadget" working? I have used (but not set up) g_ether "gadget" with ssh before and I have already read about usbserial (seems well documented on linux-sunxi wiki) so I think I will manage.
Pablo
l.
arm-netbook mailing list arm-netbook@lists.phcomp.co.uk http://lists.phcomp.co.uk/mailman/listinfo/arm-netbook Send large attachments to arm-netbook@files.phcomp.co.uk
On Tue, Aug 11, 2020 at 9:51 PM Pablo Rath pablo@parobalth.org wrote:
On Tue, Aug 11, 2020 at 12:47:51PM +0100, Luke Kenneth Casson Leighton wrote:
On Tue, Aug 11, 2020 at 12:35 PM Pablo Rath pablo@parobalth.org wrote:
On Tue, Aug 11, 2020 at 11:37:41AM +0100, Luke Kenneth Casson Leighton wrote:
Ok. I have tried that now. Pressed "2" while applying power over USB-OTG but an Allwinner USB FEL device is not found with 'sunxi-fel version'. Also tried to boot with my known working µSD-Card but there is no output on UART.
hm ok there is one more "trick" - actually uploading (and executing) the spl bootloader followed by u-boot and everything else https://linux-sunxi.org/FEL/USBBoot#Boot_the_system_over_USB
the old version, fel-boot, you had to first "run" then "execute". the newer version (sunxi-fel) looks like it does run-and-execute.
the first binary (the spl bootloader) fits into the 16k SRAM and until that's executed (and it initialises the PLL and DDR3) there's flat-out no chance of uploading anything at all into the upper areas of memory (0x42000000) which are in the DDR3 RAM area.
i have in the past set up a linux kernel to convert the USB-OTG into a usbserial "gadget", and also a usbnet-compatible g_ether "gadget". the first way was successful in showing early console logs, and the second was enough to get a USB eth0 that i could ssh in over.
So just to make sure, your advice now is to work with the standalone Computer Card and get usbserial or g_ether "gadget" working?
to check that there's actually "something" working, yes.
I have used (but not set up) g_ether "gadget" with ssh before and I have already read about usbserial (seems well documented on linux-sunxi wiki) so I think I will manage.
you need the "gadget" serial kernel config enabled, and usbserial as well, they need to be built-in, you can't use them as "module options" (.ko) if you want early boot messages.
l.
On Sun, Jul 26, 2020 at 2:31 PM Pablo Rath pablo@parobalth.org wrote:
On Sun, Jul 26, 2020 at 10:54:27AM +0100, Luke Kenneth Casson Leighton wrote:
On Sun, Jul 26, 2020 at 10:33 AM Pablo Rath pablo@parobalth.org wrote:
I am very sorry to inform everyone on this list that I had a severe power problem with my Micro Desktop 1.7. I applied power to the DC Jack and the area right to the jack burned out. (see attached picture).
thank you for sending this to the list, as i asked, after you sent it initially privately. i had this happen to a 1.5 MD board 3 years ago, but no others, despite them running for prolonged periods of time.
what i noticed about that board was that the inductor was not properly soldered down. this would be insufficient contact, introduce resistance, and at that point the RT8288 would go unstable.
Ok. As you have probably deduced from my questions I am not really into hardware. Thank you for all your explanations and clarifications. I still try to wrap my head around what should work straight away, what could work with the right modifications and what can never work...
[...]
As I said I am very sorry that I screwed up. Luke, do you have any ideas what went wrong?
not in the slightest. or - maybe: have a look at the contact points where the inductor sits on the PCB. there should be quite a lot of solder, there.
Sorry for the dumb question but where can I find the inductor?
Without the assembly drawing at my fingertips this would be my educated guess. It’s the closest component to the offending regulator IC that looks the part of an inductor. [see attached picture]
I am going to check my mini desktop PCB for good solder on the inductor. I will also look at possible modifications/improvements to that feedback circuit layout given the present PCB layout. (I have some experience with specifying rework/changes to remedy deficits in already-fabricated PCB’s.)
Best wishes, Richard
On Sunday, 26 July 2020 11:54:27 CEST Luke Kenneth Casson Leighton wrote:
you *need* a stable supply to do that (1.5 preferably 2.0 A) designed *specifically* for providing USB power. UNDER NO CIRCUMSTANCES plug the 12v PSU into the USB socket. and DO NOT use an "off-the-shelf generic 5.0v wall wart". use something SPECIFICALLY designed for providing USB power because it is (a) stable and (b) current-limited.
All this talk of regulated power supplies reminded me of this product which takes a range of inputs via the barrel jack socket:
https://proto-pic.co.uk/product/sparkfun-prt-13032-breadboard-power-supply-s...
Meanwhile, the CI20 can be powered from a USB port and employs a barrel jack socket to accept that power. According to the hardware reference it is actually "a 5V 4mm (shield) x 1.7mm (pin) center positive connector ... identical to that of the original Sony PSP":
https://www.elinux.org/CI20_Hardware#Power
I'm not sure if either of these things are relevant here, though.
Paul
arm-netbook@lists.phcomp.co.uk
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Luke Kenneth Casson Leighton -
Pablo Rath -
Paul Boddie -
Pičugins Arsenijs -
Richard Wilbur