Thanks for the information. The patch certainly seems to have cured that problem. Unfortunately, although I can now write to the Flash (and verify the contents) it seems that the image is over-written when the board reboots (i.e. the BIOS change doesn't take effect and a subsequent verification of the previously verified image fails).
Presumably there's a shadow copy left unmodified somewhere? Any ideas? Best regards, Alan Alexander mailto:[EMAIL PROTECTED] Software Toolchain Engineering Icera Inc, 2520 The Quadrant, Aztec west, Bristol BS32 4AQ, UK Tel. +44 (0)1454 284805 -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Nikolay Petukhov Sent: 23 November 2007 07:06 To: linuxbios@linuxbios.org Subject: Re: [LinuxBIOS] flashrom support for AMD CS5536 2007/11/22, "Alan Alexander" <[EMAIL PROTECTED]>: > > Hi all, > > I've recently checked out and built revision 2977 of flashrom in order > to apply a simple BIOS configuration change to approx 200 embedded Linux > devices. > Unfortunately although flashrom is able to read the contents of the BIOS > flash, writes fail to take (verification fails). > > The system basics are as follows: > IEI NanoLX Board (AMD LX800 + CS5536 + Winbond W83627EHG) > http://www.ieiworld.com/en/product_IPC.asp?model=NANO-LX > Linux Kernel Version 2.6.20 > Flash part identified by flashrom as Pm49FL004 at physical > address 0xfff80000 (512 KB) > > I see from the source code that the CS5536 chipset is directly supported > and that the code attempts to remove the write protection via MSR > 0x1808. This all looks good and yet the writes fail to take. I assume > therefore that this board is using some GPIOs to disable writes to the > BIOS flash? > > Does it sound likely that GPIOs are causing the write problem that I am > seeing? Does anyone know how I might go about figuring out which GPIOs > to look at? > > Any help would be very appreciated. > > Best regards, > > > Alan Alexander mailto:[EMAIL PROTECTED] > Icera Inc, 2520 The Quadrant, Aztec west, Bristol BS32 4AQ, UK > Tel. +44 (0)1454 284805 I have the same problems with flashrom on iei/pcisa-lx. http://www.ieiworld.com/en/product_IPC.asp?model=PCISA-LX (Flash Pm49FL004) Info from pm49fl002/4's manual: Pm49fl002/4 write protected at power up. This patch fix it. -- Nikolay -- ****************************************************************************************** This e-mail (including any attachments) is intended only for the recipient(s) named above. It may contain confidential or privileged information and should not be read, copied or otherwise used by any other person. If you are not a named recipient, please contact the sender by telephone (+44-1454-284800) and destroy the original message. Any statement and/or opinion not related to this company's business and expressed in this message is that of the author and does not necessarily reflect those of Icera. This company does not take any responsibility for the views of the author in any matter not related to the company's objective. ****************************************************************************************** -- linuxbios mailing list linuxbios@linuxbios.org http://www.linuxbios.org/mailman/listinfo/linuxbios
