Flashrom fails with Kernel 2.6.28

[Niels Ole Salscheider]

Hello,

I have just updated to Kernel 2.6.28. Now flashrom fails at the following line 
of code in cbtable.c:

low_1MB = mmap(0, 1024 * 1024, PROT_READ, MAP_SHARED, fd_mem,
    	       0x00000000);
    if (low_1MB == MAP_FAILED) {
    	perror("Can't mmap memory using " MEM_DEV);
    	exit(-2);
    }

Do you know if there is a change from 2.6.27 to 2.6.28 which could cause this 
error?

Ole

[Paul Menzel]

Dear Ole,

Am Freitag, den 26.12.2008, 14:09 +0100 schrieb Niels Ole Salscheider:
> I have just updated to Kernel 2.6.28. Now flashrom fails at the following line 
> of code in cbtable.c:
>
> low_1MB = mmap(0, 1024 * 1024, PROT_READ, MAP_SHARED, fd_mem,
>    	       0x00000000);
>    if (low_1MB == MAP_FAILED) {
>    	perror("Can't mmap memory using " MEM_DEV);
>    	exit(-2);
>    }
>
> Do you know if there is a change from 2.6.27 to 2.6.28 which could cause this 
> error?

Might [1] relate to your finding?

Thanks,

Paul

[1] http://www.coreboot.org/pipermail/coreboot/2008-December/043497.html

[Peter Stuge]

Hello,

Niels Ole Salscheider wrote:
> Do you know if there is a change from 2.6.27 to 2.6.28 which could
> cause this error?

Please check that your kernel doesn't have CONFIG_STRICT_DEVMEM set,
as it will stop flashrom from working.

Another poster reported that CONFIG_X86_PAT will also stop flashrom
from working. Please try booting with the nopat kernel parameter to
temporarily disable it.

//Peter

[Paul Menzel]

Am Freitag, den 26.12.2008, 15:08 +0100 schrieb Peter Stuge:
> Niels Ole Salscheider wrote:
> > Do you know if there is a change from 2.6.27 to 2.6.28 which could
> > cause this error?
>
> Please check that your kernel doesn't have CONFIG_STRICT_DEVMEM set,
> as it will stop flashrom from working.
>
> Another poster reported that CONFIG_X86_PAT will also stop flashrom
> from working. Please try booting with the nopat kernel parameter to
> temporarily disable it.

I added your answer to a new entry in the FAQ [1].

Thanks,

Paul

[1] http://www.coreboot.org/FAQ#Can.27t_mmap_memory_using_.2Fdev.2Fmem:_Invalid_...