How do i see printf output from the purgatory code?
Subsystems (2)
Specifically, an ia64.
I added printf() to purgatory-ia64.c, compiled, and executed the kexec command from a shell window (ie, not from a script), but i still did not see the printf i put in.
Thanks for help in advance!
- jay
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Quoted 7 lines · Jay Lan
Specifically, an ia64.
I added
printf()topurgatory-ia64.c, compiled, and executed the kexec command from a shell window (ie, not from a script), but i still did not see the printf i put in.Thanks for help in advance!
IIRC, the printf output in purgatory only shows on the VGA console.
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kexec mailing list
[email protected]
http://lists.infradead.org/mailman/listinfo/kexec
Hi,
Quoted 11 lines · Simon Horman
Quoted 7 lines · Jay Lan
Specifically, an ia64.
I added
printf()topurgatory-ia64.c, compiled, and executed the kexec command from a shell window (ie, not from a script), but i still did not see the printf i put in.Thanks for help in advance!
IIRC, the printf output in purgatory only shows on the VGA console.
No, you just have to call kexec with right parameters:
--console-serial
Enable the serial console.
--serial=port
Specify the serial port for debug output.
--serial-baud=baud_rate
Specify the baud rate of the serial port.
However, I don't know if it works on IA64, especially with SGI consoles I think one would have to patch kexec.
Also, don't use --noio (which is the default on SUSE on IA64 because we had problems on some machines without that parameter).
Bernhard
Signature · 6 lines
Bernhard Walle, SUSE Linux Products GmbH, Architecture Development _______________________________________________ kexec mailing list [email protected] http://lists.infradead.org/mailman/listinfo/kexec
Quoted 21 lines · Bernhard Walle
Hi,
Quoted 9 lines · Simon Horman
Quoted 7 lines · Jay Lan
Specifically, an ia64.
I added
printf()topurgatory-ia64.c, compiled, and executed the kexec command from a shell window (ie, not from a script), but i still did not see the printf i put in.Thanks for help in advance!
IIRC, the printf output in purgatory only shows on the VGA console.
No, you just have to call kexec with right parameters:
--console-serial
Enable the serial console.--serial=port
Specify the serial port for debug output.
Quoted 8 lines
--serial-baud=baud_rate
Specify the baud rate of the serial port.However, I don't know if it works on IA64, especially with SGI consoles I think one would have to patch kexec.
Also, don't use --noio (which is the default on SUSE on IA64 because we had problems on some machines without that parameter).
This is bad news. We need --noio option. :(
I have a 2.6.27 kernel that the kdump kernel would panic on boot, depending on the physical address of 'physical_node_map'. If it is located at the higher half of a 0xffff range, the instruction in build_cnode_tables() in arch/ia64/sn/kernel/setup.c:
memset(physical_node_map, -1, sizeof(physical_node_map));
would overwrite kern_memmap array of the kdump kernel.
It was so because, i think, the purgatory code of kexec creates a boot efi_memmap with memory regions overlaped. The above memset() put 0xff to part of memory of next region.
I am trying to debug the purgatory code :(
- jay
Quoted 3 lines
Bernhard
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