Hi David,
I will take a look at the GPIO controls for this chip set.
Is it possible that the newer version of flashrom version 0.9.4-r1394
has this chip set in it?
Regards,
Ken Frost
On 09/06/2011 08:33 PM, David Hendricks wrote:
On Tue, Sep 6, 2011 at 2:13 PM, Kenneth Frost <[email protected]
<mailto:[email protected]>> wrote:
Greetings,
I tried to flash this system with an updated bios using flashrom
utility. The flash chip found was a "SST 49LF008A". I
successfully read the flash to a filename, verified the image read
and determined the flash chip on the board.
Hi Ken,
I would guess that there is some GPIO-controlled write protection
mechanism enabled on that board. Sometimes you can disable these thru
BIOS settings, though it's entirely up to the vendor whether or not to
expose that.
Of course, rebooting and toggling that setting in the BIOS is sort of
a pain and probably unfeasible if you wish to support more than a
small handful of motherboards. So it's usually preferable to toggle
that setting in Flashrom. In Flashrom's board_enable.c file, you'll
see several routines which do things like raise a GPIO to disable
write protection. You'll probably need to do something similar for
your board.
If you're reasonably familiar with the chipset you're using
(SCH US15WPT), you can try to determine the write protection setting
experimentally. Here is one example of how to do it:
http://www.coreboot.org/pipermail/coreboot/2009-September/051987.html .
Much of the tedious info such gathering and calculating base addresses
and offsets can be found from flashrom verbose output when you perform
a read operation. iotools <http://code.google.com/p/iotools/> can also
make your life easier when doing simple low-level operations.
--
David Hendricks (dhendrix)
Systems Software Engineer, Google Inc.
--
OEM CONTROLS Inc.
10 Controls Drive work: (203) 929-8431
Shelton, CT 06484 email: [email protected]
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