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  1. Bug #1415562
  2. Comment #19

Comment 19 for bug 1415562

Revision history for this message
bugproxy (bugproxy) wrote : Comment bridged from LTC Bugzilla

------- Comment From <email address hidden> 2015-02-10 10:04 EDT-------
Below is the documentation for fadump:
________________

Firmware-assisted dump

Firmware Assisted Dump (fadump) is an alternative to kdump crash dumping mechanism,
available in powerpc architecture. To understand how fadump works, please refer to
the kernel documentation below:

https://www.kernel.org/doc/Documentation/powerpc/firmware-assisted-dump.txt

Two steps are needed to use fadump as the crash dumping mechanism. Firstly,
enabling fadump by passing "fadump=on" to kernel. Secondly, registering fadump
by echo'ing `1` to /sys/kernel/fadump_registered.

1. To enable fadump:

a. Add "fadump=on" to GRUB_CMDLINE_LINUX in /etc/default/grub file.
b. Rebuild grub config
# grub-mkconfig -o /boot/gru/grub.cfg
c. Reboot

2. To register fadump:

kdump-tools, scripts and tools for automating kdump, is updated to make it fadump aware.
When fadump is enabled, kdump-tools registers fadump as crash dumping mechanism,
by echo'ing `1` to /sys/kernel/fadump_registered. For more help, see:

# kdump-config help

NOTE: If fadump fails to collect dump with Out Of Memory error, use "fadump_reserve_mem="
parameter to spike up the memory reserved for firmware-assisted dump.

____________________

Breno, please add this to
https://wiki.ubuntu.com/ppc64el/

Thanks
Hari