Re: [flashrom] DOS binary doesn't work?

[Stefan Reinauer]

* max  [101012 07:33]:
> --- On Mon, 10/11/10, max  wrote:
> > Thank you, lspci yielded some interesting information. On
> > the linux that works, there are two kernel modules
> > associated with device 8086/24C0 (where the write enable
> > register is located): iTCO_wdt and intel-rng. Those modules
> > are not present on the linux that doesn't work.
>
> Ok, I have the answer. It was iTCO_wdt, not intel_rng as I first guessed. iTCO_wdt clears bit 13 (TCO_EN) of SMI_EN. This is what allows flashrom to enable writing (tested by clearing the bit with a debugger and running DOS flashrom).
>
> from iTCO_wdt.c iTCO_wdt_init:
>    /* Bit 13: TCO_EN -> 0 = Disables TCO logic generating an SMI# */
>    val32 = inl(SMI_EN);
>    val32 &= 0xffffdfff;	/* Turn off SMI clearing watchdog */
>    outl(val32, SMI_EN);

Nice finding! Don't you love the effectiveness of SPI flash protection?
:)

Stefan