[coreboot] Minimum RAM requirements for coreboot (under Qemu)

bifferos bifferos at yahoo.co.uk
Sun May 17 17:04:58 CEST 2009

Coreboot seems to require a minimum of 64MB to run, but I would like to port it to a platform with only 32MB.  I noticed in:


there is the line:

	movl	$0x4000000, %esp

which I have changed to 

	movl	$0x2000000, %esp

The boot now gets a lot further, but my payload (FILO) still doesn't 
appear to run.

Is there some fundamental reason why platforms with <64MB are not 

The last thing I see is:

Copying Interrupt Routing Table to 0x000f0000... done.
Copying Interrupt Routing Table to 0x03ff0000... done.
Moving GDT to 0x3ff0400...ok
Multiboot Information structure has been written.
Writing high table forward entry at 0x00000500
Wrote coreboot table at: 00000500 - 00000518  checksum f3df
New low_table_end: 0x00000500
Now going to write high coreboot table at 0x03ff0800
rom_table_end = 0x03ff0800
Adjust low_table_end from 0x00000500 to 0x00001000
Adjust rom_table_end from 0x03ff0800 to 0x04000000

So no surprise that it doesn't work, but how/where do I change 
these values?



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