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Date: Sat, 6 Oct 2007 16:03:47 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: x11@freebsd.org
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Subject: Using /dev/mem to read video BIOS ROM
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Xorg says my video BIOS ROM is at 0xDFEC0000:

romsave = pciReadLong(Tag, PCI_MAP_ROM_REG);  (in Pci.c/handlePciBIOS)

Using /dev/mem to read the ROM works, but at offset 0xC0000.

"romsave & 0x000fffff" can't be the general way to convert from address 
to /dev/mem offset.

-Warren Block * Rapid City, South Dakota USA