[U-Boot-Users] PCI video display in MPC8270

Wolfgang Denk 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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> Content-Transfer-Encoding: quoted-printable
> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><HTML

And please NEVER post HTML to this list!

Best regards,

Wolfgang Denk

Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
"Go to Heaven for the climate, Hell for the company."    - Mark Twain

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