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Re: PIO only CF card boot

From: Vladimir 'phcoder' Serbinenko
Subject: Re: PIO only CF card boot
Date: Wed, 07 Oct 2009 11:24:22 +0200
User-agent: Mozilla-Thunderbird (X11/20090701)

Felix Zielcke wrote:
> Am Dienstag, den 06.10.2009, 18:08 -0600 schrieb Christopher Brooks:
>> Hi,
>> I’m booting off of a CF card (Kingston 32gig elite pro).  The card
>> reader I’m using doesn’t support DMA, and won’t boot off of this card.
>> Grub fails in stage 2 with error 25 (disk read error).  I think (not
>> sure) grub is trying to use dma mode to load menu.lst in stage 2, and
>> the device is timing out.  I would like to build/configure grub such
>> that it doesn’t try and load menu.lst using dma mode, but instead just
>> defaults to pio mode.
>> Tips on how to accomplish this?  Does it seem like a reasonable
>> explanation for what is happening?
> GRUB Legacy isn't anymore supported by us.
> Use GRUB 2.
> But it also relies on the BIOS to read data from it.
> Maybe you have luck and it works with it.
> But maybe your BIOS is broken and that could only be avoided if we would
> write a drvier for your card reader.
> If it's USB you could try 
> insmod uhci (or ohci depends on your USB controller)
> insmod usbms
> ls might show it
Compact Flash is likely to be ATA. Try ata.mod

Vladimir 'phcoder' Serbinenko
Personal git repository: http://repo.or.cz/w/grub2/phcoder.git 

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