Kernel cmdline limited to 256 characters in pxeboot

[Tobin Davis]

The default # of characters allowed in the omap4 kernel is set at 512 according to /usr/src/linux-headers-3.0.0-1200-omap4/include/asm-generic/setup.h, however u-boot only allows 256 on the append line in the pxe config. With the panda, this is severely limiting due to the need to work around a known memory hole with mem=456M@0x80000000 mem=512M@0xA0000000. Either the memory hole is left unmasked, which may cause random kernel oops during an image install, or netinstall cannot effectively be preseeded for full automation.

Working length:
append vram=32M mem=456M@0x80000000 mem=512M@0xA0000000 fixrtc debian-installer/framebuffer=false console=ttyO2,115200n8 url=http://master.gruenet/preseed/preseed.cfg locale=en_US setup/layoutcode=en_US console-setup/layoutcode=en_US auto netcfg/get_hostname=

Failing length:
append vram=32M mem=456M@0x80000000 mem=512M@0xA0000000 fixrtc quiet debian-installer/framebuffer=false console=ttyO2,115200n8 url=http://master.gruenet/preseed/preseed.cfg locale=en_US setup/layoutcode=en_US console-setup/layoutcode=en_US auto netcfg/get_hostname=

Difference is the addition of "quiet" to reduce the noise level of kernel boot messages.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: u-boot (not installed)
ProcVersionSignature: User Name 3.0.0-1200.2-omap4 3.0.0-rc7
Uname: Linux 3.0.0-1200-omap4 armv7l
Architecture: armel
Date: Tue Aug 2 18:25:06 2011
ProcEnviron:
 SHELL=/bin/bash
 LANG=en_US.UTF-8
SourcePackage: u-boot
UpgradeStatus: No upgrade log present (probably fresh install)

[John Rigby (jcrigby)]

I believe that this bug was actually caused by CONFIG_SYS_MAXARGS being set too low. It was once 16 but is now 32. This has fixed several other related bugs.