[U-Boot-Users] PCI video display in MPC8270
wd at denx.de
Sat Jul 2 00:45:50 CEST 2005
in message <38948EB93E24844E9911E0E932C0466470B1CC at plum.raritan.com> you wrote:
> 1. Does our system require a VGA BIOS (aside from U-boot) to display
> console (and later on to display a GUI, i.e. X Windows, Tiny X)?
Probably yes; alternatively you can try an enable the x86 emulation
code in U-Boot and use this to run the card BIOS init code.
> 2. Is it possible to configure the Kernel to do the PCI video card
> initialization without involving U-boot so that it will at least display
> a VGA console 80x25?
Everthing is possible, if you spend enough effort on it. In this case
you will probably need some form of x86 emulation in Linux.
> 3. Do I actually need to write a driver for the Z7 in U-boot (similar to
> CT9000, SMI 710/712/810) to configure the video chip correctly before
> Linux takes over?
YOu probably don't need a graphics driver but somce code to
initialize the card, either in U-Boot or in Linux. Given the fact
that you will most probably have to run the card's BIOS code yuou
need an x86 emulation. This is easier in the U-Boot context than in
> 4. I still like to send U-boot console messages to the MPC8270 (SCC)
> serial port and just start the VGA console once Linux takes over. Is
> this possible?
Yes, of course.
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Software Engineering: Embedded and Realtime Systems, Embedded Linux
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