Commits
Jason Gunthorpe committed 0f054e3ceab
ARM: 7949/1: feroceon: Log a FW_BUG if the L2 cache is turned on at boot Booting on feroceon CPUS requires the L2 cache to be turned off. With some kernel configurations (notably CONFIG_ARM_PATCH_PHYS_VIRT disabled) the kernel will boot even if the L2 is turned on. However there may be subtle breakage, and when PATCH_PHYS_VIRT is enabled it is very likely that booting with L2 will crash at early boot before any kernel diagnostic output. The diagnostic message is intended to discourage people from shipping bootloaders that leave the L2 turned on. The issue on feroceon is that the L2 is bypassed when the L1 caches are disabled. So the decompressor will place parts of the kernel image into the L2 and the early cache-off boot code in head.S will write to parts of the kernel image, bypassing the L2 and creating inconsistency. Tested on ARM Kirkwood. Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com> Acked-by: Jason Cooper <jason@lakedaemon.net> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>