what's the current status of your machine? Please see below for some news.
On 18.10.2009 18:11, Luc Verhaegen wrote:
On Sat, Oct 17, 2009 at 03:40:43PM +0200, Yuri Schaeffer wrote:
Hi, I tried to flash to the latest BIOS for my board but it failed at verifying. The backup I made a few minutes earlier has the same problem. I did not (dare to) reboot the system. Attached flashrom output and lspci -vvnnxxx.
board: via epia cn 1000eg southbr: VT8237R Plus (according to the specs) flashrom: v0.9.1-r750 bios image: 1.14, 2009/07/31, http://www.via.com.tw/servlet/downloadSvl?id=400&download_file_id=4942
Currently I have no idea how to repair my system. Folks at #flashrom pointed me to here.
Conclusion for this is that this is most likely a broken flashchip.
Rudolf and Carl-daniel spent a lot of time working with Yuri on irc to try to resolve this, to no avail.
Rudolf provided a quick hack to try to at least have the checksum be correct and hopefully have the machine boot again.
But the final solution for Yuri is probably getting a new chip from somewhere.
I found a bug in flashrom which could partially explain what Yuri was seeing. It was already present in the first revision of flashrom back in 2003 and will only appear in very special circumstances which are very difficult to hit. I had to read a few datasheets twice before even seeing what was wrong. "Enable protection" is a command with side effects on some chips (the side effect is trashing the contents of address 0x5555 with subsequent commands). To see the effect, you have to have bad luck with chip timing, exact chip type, the kernel process scheduler, delay calibration and others.
Anyway, I think I can look at this again and maybe find out what exactly went wrong.