Joshua McDowell wrote:
Forcing the use of "SST49LF160C" as the prom dumps the bios perfectly every time, even before the use of the newly discovered source code.
Unfortunately that doesn't mean very much.
A forced read disregards everything needed for writing or erasing a chip and only tries desperately to read the contents. It's only some minimal functionality that doesn't help us for write or erase.
Maybe you can try playing with the rom_jumper source a bit. Try to get it where it says that the jumper value is 1-2 instead?
Maybe there is even a hardware jumper on the board? Can you check?
//Peter
On Thu, 21 May 2009 20:41:24 +0200, Peter Stuge peter@stuge.se wrote:
Joshua McDowell wrote:
Forcing the use of "SST49LF160C" as the prom dumps the bios perfectly every time, even before the use of the newly discovered source code.
Unfortunately that doesn't mean very much.
A forced read disregards everything needed for writing or erasing a chip and only tries desperately to read the contents. It's only some minimal functionality that doesn't help us for write or erase.
Maybe you can try playing with the rom_jumper source a bit. Try to get it where it says that the jumper value is 1-2 instead?
Maybe there is even a hardware jumper on the board? Can you check?
Sounds like you may have to get out the meter and do some physical tracing...
On Thu, 21 May 2009 14:44:43 -0400, Joseph Smith joe@settoplinux.org wrote:
On Thu, 21 May 2009 20:41:24 +0200, Peter Stuge peter@stuge.se wrote:
Joshua McDowell wrote:
Forcing the use of "SST49LF160C" as the prom dumps the bios perfectly every time, even before the use of the newly discovered source code.
Unfortunately that doesn't mean very much.
A forced read disregards everything needed for writing or erasing a chip and only tries desperately to read the contents. It's only some minimal functionality that doesn't help us for write or erase.
Maybe you can try playing with the rom_jumper source a bit. Try to get it where it says that the jumper value is 1-2 instead?
Maybe there is even a hardware jumper on the board? Can you check?
Sounds like you may have to get out the meter and do some physical tracing...
Well, for what it is worth, most Intel boards have at least four devices with GPIO's. Nothbridge (mostly used for grahpics), Southbridge, SuperIO, and the FWH even has GP lines. So if you don't have the schematics your best bet is to trace the unlock pin from the FWH and see where it goes. Hope that helps.
Also, the factory flash docs never mention changing a jumper..
Joshua McDowell - Lead integrator
Sent from my Blackberry
-----Original Message----- From: Peter Stuge peter@stuge.se
Date: Thu, 21 May 2009 20:41:24 To: coreboot@coreboot.org Subject: Re: [coreboot] jarrell_rom_jumper.c ( I think I found it )
Joshua McDowell wrote:
Forcing the use of "SST49LF160C" as the prom dumps the bios perfectly every time, even before the use of the newly discovered source code.
Unfortunately that doesn't mean very much.
A forced read disregards everything needed for writing or erasing a chip and only tries desperately to read the contents. It's only some minimal functionality that doesn't help us for write or erase.
Maybe you can try playing with the rom_jumper source a bit. Try to get it where it says that the jumper value is 1-2 instead?
Maybe there is even a hardware jumper on the board? Can you check?
//Peter
-- coreboot mailing list: coreboot@coreboot.org http://www.coreboot.org/mailman/listinfo/coreboot
-
Joseph Smith -
Joshua McDowell -
Peter Stuge