On 03/26/12 22:54, Tadas Slotkus wrote:
Hi,
the schematic looks good. Sorry I haven't noticed this thread earlier. I don't know what's your mainboard, but I had some problems with mine since EFI writes to flash during power up?/down? cycles and doesn't like hot switched chip during poweroff. Anyways, better be prepared to use external programmer, like „wiggler clone“ in case of everything fails.
Goodluck, Tadas (Mrtadis)
Thanks, if people here atleast all agree that its sound, I'll send it off to seeed to have it printed.
From what I understood, SPI is a shared bus, so Chip Select 0/1 should allow you to switch between various chips/eeproms.
So even if one's motherboard is completly weird, I guess having chipselect on chip 1 first, boot, then while booted swap to 2, flash new bios, switch back to 1, shutdown. This should work (I cannot image the bios/uefi, constantly writing to the eeprom?
Then when powerd down, move your jumpercap/switch back to the newly flashed eeprom and you should be golden. If the new flash is coreboot, it shouldn't be a problem anymore, if the new flash is some other bios/uefi, then take caution when swapping.
But this is what I suspect, I'm sure there's many more people on this list who actually really know what happens ;)
Oliver