答复: /dev/bios for 2.6 - coreboot

10 Feb 2004


      Why not use flash_rom in freebios2/util?
YH
-----邮件原件-----
发件人: ebiederman@lnxi.com [mailto:ebiederman@lnxi.com] 
发送时间: 2004年2月10日 9:10
收件人: RSmith@bitworks.com
抄送: stepan@suse.de; linuxbios@clustermatic.org
主题: Re: /dev/bios for 2.6
Richard Smith rsmith@bitworks.com writes:
...
Eric W. Biederman wrote:
...
If you look in jedec_probe.c AM29F040, and AM29LV040B are supported so
if
...
...
it is not it should be just a tiny tweak to jedec probe to get the chip
recognized.
Ah.. jdec_probe ok well that gives me a place to start.  I'll go see if I
can
...
tweak that to find a AM29F040B.  I would have though that the AM29F040 id
would
...
have matched.
It might I don't know how you have things configured.
...
...
...
The MTD webpage dosen't have any info and I build and inserted lots of
different mtd
modules but nothing indicated they did anything.
Do you have a proper map driver?
Er... I don't know.  How do I check?
MTD has 3 levels of drivers.
- The map driver (i.e. ich2rom and amd76xrom ) which knows how to find
  the ROM chip on a specific board, or chipset.   
- The probe driver (cfi_probe or jedec_probe) which knows how to detect
  which ROM chip you have.
- The chip driver (cfi_cmdset_0001 cfi_cmdset_002..) which knows how
  to use a specific command set regardless of which device you have.
...
I've not found any documentation explaining anything about useing the MTD
with
...
BIOS type flash chips.  Its all Msystems or CF stuff so I've just been
guessing.
...
My chip is hanging out just like a normal BIOS chip would at physical
address
...
0xfff80000 - 0xffffffff.  The 1Meg extended BIOS space area should be
enabled in
...
my chipset.  So BIOS chipselects should be generated for 0xfff0ffff up.
There was an option in the kernel building that asked for a start address
and a
...
size to which I entered 0xfff80000 and 0x80000.
Hmmm... come to think about it now I may have entered 0x80000 rather than
0xfff80000 as the start address..
In any case.. given my setup what and where do I config this?
Basically it depends on the map driver you are using.  Some of them
can look at your chipset and figure these things out.  Some are really
generic and you have to hard code things.  I don't know if those
work at all.
Eric
_______________________________________________
Linuxbios mailing list
Linuxbios@clustermatic.org
http://www.clustermatic.org/mailman/listinfo/linuxbios