On Mon, Jan 16, 2023 at 6:56 PM Andreas Grapentin andreas@grapentin.org wrote:
I’ve found the parabola image I used back in 2021, and tried to boot it on an EOMA card revision 2.7.4 and a microdesktop revision 1.7
brilliant
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.
Apart from that, I currently can’t get the system to boot. I have output from the boot loader, but it’s not much:
U-Boot SPL 2017.01-2 (Jan 18 2017 - 21:30:38) DRAM: 2048 MiB CPU: 912000000Hz, AXI/AHB/APB: 3/2/2 Trying to boot from MMC2MMC Device 1 not found spl: could not find mmc device. error: -19 SPL: failed to boot from all boot devices ### ERROR ### Please RESET the board ###
ok if you've no power on the MD then the Level Shifter IC will not be powered up and the MicroSD card socket obviously will not be recognised.
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.
in the meantime, I’ll prepare a magnet link / http direct download for the image I’m using, in case it’s useful for someone else. I’ll send those links to the list ASAP.
awesome.
l.