[coreboot] Dual SPI Flash
oliver+list at schinagl.nl
Tue Mar 27 00:11:23 CEST 2012
On 03/26/12 22:54, Tadas Slotkus wrote:
> 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.
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 ;)
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