On 16. Jan 2023, at 20:01, Luke Kenneth Casson Leighton lkcl@lkcl.net wrote:
On Mon, Jan 16, 2023 at 6:56 PM Andreas Grapentin andreas@grapentin.org wrote:
In the process of attaching peripheries, I must have blown something on the microdesktop, the power LED no longer lights up, tested multiple chargers. I’m fairly certain that the LED did light up green when I started working on the board today. Is it possible that I blew a fuse somewhere?
yes it should. no there's no fuse. you'll need a multimeter, be *careful*. i suggest taking the Card out. if it's really borked you can power it with a 5V USB "charger" cable (into the 2 standard USB sockets).
also, check you inserted the Card correctly: not one row along or one pin along, and make sure no contact between the two PCBs.
forgot to mention, I’m using the expansion header on the micro desktop for the UART connection. Power to the EOMA card directly through the microUSB works, that’s what I’m doing right now. I haven’t tried the USB sockets on the micro desktop though, that might be worth a shot.
I’m confident that this is salvageable, considering that I do get boot loader output through UART. I’ll keep looking into it. If you have any hints, I’d appreciate it.
it's possible to reconfigure u-boot (etc) to have the OS on the Card's micro-sd.
I believe I’m using a quite old u-boot boot script. Included below. I’m not too familiar with u-boot, any tips what needs to be changed to switch the microSD slot, or maybe include a fallback option to try booting from the internal microSD if the external one is unavailable?
if test -n ${distro_bootpart}; then setenv bootpart ${distro_bootpart}; else setenv bootpart 1; fi part uuid ${devtype} ${devnum}:${bootpart} uuid
setenv bootargs console=${console} root=PARTUUID=${uuid} rw rootwait
if load ${devtype} ${devnum}:${bootpart} ${kernel_addr_r} /boot/zImage; then if load ${devtype} ${devnum}:${bootpart} ${fdt_addr_r} /boot/dtbs/${fdtfile}; then if load ${devtype} ${devnum}:${bootpart} ${ramdisk_addr_r} /boot/initramfs-linux.img; then bootz ${kernel_addr_r} ${ramdisk_addr_r}:${filesize} ${fdt_addr_r}; else bootz ${kernel_addr_r} - ${fdt_addr_r}; fi; fi; fi