Commit 0f054e3c authored by Jason Gunthorpe's avatar Jason Gunthorpe Committed by Russell King

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: default avatarJason Gunthorpe <jgunthorpe@obsidianresearch.com>
Acked-by: default avatarJason Cooper <jason@lakedaemon.net>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 5b61d4a5
......@@ -331,7 +331,9 @@ static void __init enable_l2(void)
enable_icache();
if (d)
enable_dcache();
}
} else
pr_err(FW_BUG
"Feroceon L2: bootloader left the L2 cache on!\n");
}
void __init feroceon_l2_init(int __l2_wt_override)
......
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