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Re: [Qemu-devel] OS/2 PPC booting making some progress
From: |
Tero Kaarlela |
Subject: |
Re: [Qemu-devel] OS/2 PPC booting making some progress |
Date: |
Sun, 22 May 2005 16:49:57 +0300 |
User-agent: |
Mozilla/5.0 (OS/2; U; Warp 4.5; en-US; rv:1.0.1) Gecko/20020919 IBM Web Browser for OS/2 |
J. Mayer wrote:
2. on debug 2. What is this unaffected IO port 838 it tries to read &
write ?
This port is not documented in the PREP specification. You should check
in the Linux kernel to see if this port seems important. Or you may take
a look to Motorola PowerStack documentation: those boards are well
documented and OS/2 is supposed to know how to boot on it.
Hmmm I found following info from OS/2 stanza files(files describing
hardware to bootloader:
rdf.stz
planar_ide_0:
dev_class = IDE
adap_name = "IDE Disk Controller"
setting = "io:ide_int_reg:838" <=
setting = "io:ide_ctrl:3f6-3f7"
setting = "io:ide_cmd:1f0-1f7"
setting = "irq:ide_irq:d"
setting = "arb:ide_arb:6"
setting = "intrtn:ide_rtn:0"
So port 0838 is ide_int_reg
and from ppc_info.stz:
#Delmar/SouthWind
6050:
name = "IBM Delmar / South Wind PowerPC Platform"
pci_config_space = 0x80800000
bus = isa:4
bus = pci:4
built_in = planar_kbd
built_in = planar_mouse
built_in = planar_floppy
built_in = ppc_planar_parallel
built_in = COM1
built_in = COM2
built_in = CMOS_type1
built_in = planar_ide_0
built_in = planar_ide_1
So my guess is that OS/2 ppc reads machine configuration from these
files instead of residual data.
3. Might that unsupported ioport prevent booting?
Can be possible...
Have to check the code that uses that I/O port...
[...]
Hmmm... i succeeded to make it go further with following options:
boot-device ide_cdrom2
boot-fs cdrom
then it works and loads boot.cfg from cd-image
shows all lines from boot.cfg (and I have option to uncomment/change all
these)
loads kernel & device drivers into memory(as defined in boot.cfg)
but after boot.cfg has been completely read and real boot should start
it gives me invalid/unsupported opcodes again.
Tero