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[Xen-devel] [PATCH][RFC] gfx_passthru: warning when vgabios rom has inva
| To: | weidong.han@xxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxx, Ian.Jackson@xxxxxxxxxxxxx |
|---|---|
| Subject: | [Xen-devel] [PATCH][RFC] gfx_passthru: warning when vgabios rom has invalid checksum |
| From: | Noboru Iwamatsu <n_iwamatsu@xxxxxxxxxxxxxx> |
| Date: | Mon, 22 Feb 2010 14:45:21 +0900 |
| Cc: | |
| Delivery-date: | Sun, 21 Feb 2010 21:46:29 -0800 |
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Hi, According to the "PCI Firmware Spec Rev 3.0", the system firmware have to write the new checksum after resizing the expansion ROM area. So, when re-using the shadowed VGABIOS, the checksum must be valid, and if it is invalid, we should consider the BIOS has a bug or memory area is corrupted. This patch just add the warning message when checksum requires recalculation. I tried this following environments. Intel DX58SO + GeForce GTS250: checksum is OK. Intel DX58SO + GeForce 9600GT: checksum is OK. Fujitsu Q35 M/B + IGD: checksum is bad. What do you think, Weidong? Is just warning enough? Or, should we stop loading the rom? Regards, Noboru.
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