[SerialICE] Bricking (and unbricking) your board.
Myles Watson
mylesgw at gmail.com
Tue Jul 6 23:58:45 CEST 2010
I was surprised how easy it was to brick my board. These ideas might
be useful to somebody:
Before you start messing with PCI & I/O values that might keep their state:
- have a lspci -vvvxxx from the factory BIOS
- record as much of the boot process from the factory BIOS as possible
I wanted to collect the bit masks from my factory BIOS, so I modified
the filter to return 0x0 and then 0xffffffff for the PCI registers.
That way I could see which bits were being changed. After some of the
registers were changed, I couldn't boot the board with Coreboot or the
factory BIOS. I used SerialICE to set the PCI values to what they
were in a saved run of the factory BIOS, and it booted again.
Thanks,
Myles
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