I have done some interesting test. I plug one display adapter to the MB, and let linuxbios excute onboard vga option rom at first, and then option rom in addon card. Then power down and I unplug the add on card At last boot the system, after linuxbios, it works well.
The option rom in Adapter init the Font Mem and it can last some time even power off the MB....Funny.....
YH
On Thu, 13 Jan 2005, YhLu wrote:
The option rom in Adapter init the Font Mem and it can last some time even power off the MB....Funny.....
dram is like that. When I was still designing microprocessor boards, and the microprocessor hung, I would power cycle it and if I got back quickly, most of the dram was still filled with whatever was there before the power cycle. Useful for debugging.
That's why some places like to have dram powered off for many many hours before they consider it 'wiped clean'.
ron
On Thu, 2005-01-13 at 15:22, YhLu wrote:
I have done some interesting test. I plug one display adapter to the MB, and let linuxbios excute onboard vga option rom at first, and then option rom in addon card. Then power down and I unplug the add on card At last boot the system, after linuxbios, it works well.
The option rom in Adapter init the Font Mem and it can last some time even power off the MB....Funny.....
Probably we still have some problem forwarding legacy VGA IO/MEM to PCI bus?
Ollie
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Li-Ta Lo -
Ronald G. Minnich -
YhLu