BIOS chip detect 12V, flash 5V
Posted: Wed Jul 14, 2004 4:44 pm
Hi!
This issue may interest someone, deep in BIOS flashing ...
During my dead mobo investigations I faced one strange issue on BIOS flashing, namely two same brand/type BIOS chips couldn't be re-flashed and seemed to be having bad blocks. But, after changing the flash voltage on the mobo, the chip was "cured by wonder" and allowed re-flashing all OK, i.e. came into life and work 100%!
This BIOS chip is a ST Microelectronics M28F101-150PI 128kB DIP32 chip. The mobo, on which I did make this "innovation" is a Shuttle HOT-569 v2.0 AT/S7 mobo with dual voltage flash option by jumper setting.
So, the BIOS chip had to be detected on 12V, but the flash voltage jumper changed to 5V after that before beginning the flashing with uniflash.exe.
I wonder, if this kind of trick may apply also on some other "bad-block" and to trash doomed chips, quite strange behaviour anyway ...
Best regards,
Pete V.
This issue may interest someone, deep in BIOS flashing ...
During my dead mobo investigations I faced one strange issue on BIOS flashing, namely two same brand/type BIOS chips couldn't be re-flashed and seemed to be having bad blocks. But, after changing the flash voltage on the mobo, the chip was "cured by wonder" and allowed re-flashing all OK, i.e. came into life and work 100%!
This BIOS chip is a ST Microelectronics M28F101-150PI 128kB DIP32 chip. The mobo, on which I did make this "innovation" is a Shuttle HOT-569 v2.0 AT/S7 mobo with dual voltage flash option by jumper setting.
So, the BIOS chip had to be detected on 12V, but the flash voltage jumper changed to 5V after that before beginning the flashing with uniflash.exe.
I wonder, if this kind of trick may apply also on some other "bad-block" and to trash doomed chips, quite strange behaviour anyway ...
Best regards,
Pete V.