[coreboot] Re: Placing coreboot in system memory

[Peter Stuge]

Julian Stecklina wrote:
> I was asking, because we see coreboot memcpy'ing to ROM. We map it to
> 0xFF00_0000 and it's copying 0xee8 bytes of memory from 0xff20_0300 to
> 0xff20_0300 (the same memory). So this is basically a NOP, but very weird.

Right after reset it wouldn't be a NOP, but this seems to be a lot later.

(Real mode f000:0000 after reset maps to physical ffff0000.)
> CBFS: Found 'fallback/romstage' @0x80 size 0x3ba0 in mcache @0x00014e2c
> WARN - MOVS to ROM at RIP ffffdc2f RCX ee8 ff200300->ff200300

I guess this is in 32-bit mode. coreboot leaves real mode quickly.

Anyway, memory mapped sounds correct for QEMU. :)

//Peter