It looks like this is now fixed upstream in v3.15-rc6 by commits:
a5980d0 and a2dd5da
** Changed in: linux (Ubuntu)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1306677
Title:
[PPC64EL] kernel command line gets truncated at 512
Status in “linux” package in Ubuntu:
Fix Released
Status in “linux” source package in Trusty:
Fix Released
Bug description:
Booting the PPC64EL kernel the command line get truncated at 512
characters. This looks to be a hard limit defined in
arch/powerpc/boot/opts.h.
The MaaS project, needs to be able to provide a command line longer
than 512 characters, as iscsi targets and cloud-init parameters are
passed through the kernel command line.
Command line passed to kernel through grub:
nomodeset
iscsi_target_name=iqn.2004-05.com.ubuntu:maas:ephemeral-ppc64el-generic-trusty-daily
iscsi_target_ip=10.245.71.1 iscsi_target_port=3260 iscsi_initiator=maas-enlist
ip=::::maas-enlist:BOOTIF ro
root=/dev/disk/by-path/ip-10.245.71.1:3260-iscsi-iqn.2004-05.com.ubuntu:maas:ephemeral-ppc64el-generic-trusty-daily-lun-1
overlayroot=tmpfs
cloud-config-url=http://10.245.71.1/MAAS/metadata/latest/enlist-preseed/?op=get_enlist_preseed
log_host=10.245.71.1 log_port=514 -- console=hvc0,19200n8 console=hvc1,19200n8
console=ttyS1,19200n8 BOOTIF=01-4a:03:3e:b8:37:66
Command line truncated by the kernel:
BOOT_IMAGE=ppc64el/generic/trusty/daily/boot-kernel nomodeset
iscsi_target_name=iqn.2004-05.com.ubuntu:maas:ephemeral-amd64-generic-trusty-daily
iscsi_target_ip=10.245.71.1 iscsi_target_port=3260 iscsi_initiator=maas-enlist
ip=::::maas-enlist:BOOTIF ro
root=/dev/disk/by-path/ip-10.245.71.1:3260-iscsi-iqn.2004-05.com.ubuntu:maas:ephemeral-amd64-generic-trusty-daily-lun-1
overlayroot=tmpfs
cloud-config-url=http://10.245.71.1/MAAS/metadata/latest/enlist-preseed/?op=get_enlist_preseed
log_host=10.245.71.1 log_
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