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Booting a C360 with a graphic console


I am trying to netboot (tftpboot) a C360 (PDC revision 1.5) with the current
The GSC graphic adapter is a HP A4071B (Revision 8.04/11), connected to a
fixed frequency monitor (1280x1024 @ 72 Hz).

But it isn't succesfull :

> boot lan
Interact with IPL (Y, N, Q)?. y


Boot IOO Dependent Code (IODC) revision 2

SOFT Booted.
palo ipl 1.14 root@duet Sat Apr  8 16:08:16 EDT 2006

Boot image contains:
    0/vmlinux32 4187837 bytes @ 0x9800
    0/vmlinux64 5798635 bytes @ 0x408000
    0/ramdisk 3201985 bytes @ 0x990000

Information: No console specified on kernel comman line. This is normal.
PALO will choose the console currently used by firmware (graphics).Current
command line:
0/linux initrd=0/ramdisk console-tty0 sti=10/0/4/0 sti_font=VGA8x16 TERM=linux
 0: 0/linux
 1: initrd=0/ramdisk
 2: console=tty0
 3: sti=10/0/4/0
 4: sti_font=VGA8x16
 5: TERM=linux

? b

start_kernel(): bug: interrupts were enabled early
Console: colour dummy device 160x64

Then, any text disappear from the display.
The Tux don't appear.
There are some horizontal erratic strings on the screen during 2 - 3 seconds
(similar to the ones during the probing of the graphic adapter through the PDC).
The machine do apparently not hang, since the first LED on the front panel is
beating, but there is no longer any display.

I suspect that the graphic adapter is no longer driven with the 72 Hz video
mode after the point where the Tux should appear, but perhaps with the more
"modern" mode of 75 Hz VESA. Is there a way to verify that and to pass a
parameter to the kernel in order to operate the graphic adapter with a
definite video mode at boot time ?

The other questionable point is about the sti argument; the PDC is listing the
graphic adapter with the following parameters :
	Path: GRAPHICS(1)
	Decimal: 8/4
But the proposed PALO command line contains the argument "sti=10/0/4/0".
What is the right argument ? 10/0/4/0 ? 8/4 ? GRAPHICS(1) ? Or is this
parameter irrelevant if there is only one graphic adapter ?

Thanks in advance for all hints and help.


P.S. :

The graphic adapter is supporting the following graphic modes :
1280 x 1024 @ 72 Hz
1280 x 1024 @ 60 Hz
1280 x 1024 @ 75 Hz VESA

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