From: Nicolas Pitre Date: Mon, 21 Feb 2011 05:57:33 +0000 (+0100) Subject: ARM: 6748/1: ignore mdesc->boot_params if out of range X-Git-Tag: v2.6.39-rc1~463^2^2~2 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3572bea8cbc57f0bef1e0f4580c01717df7026d8;p=pandora-kernel.git ARM: 6748/1: ignore mdesc->boot_params if out of range The initial MMU table created in head.S contains a 1 MB mapping at the start of memory to let the early kernel boot code access the boot params specified by mdesc->boot_params. When using CONFIG_ARM_PATCH_PHYS_VIRT it is possible for the kernel to have a different idea of where the start of memory is at run time, making the compile-time determined mdesc->boot_params pointing to a memory area which is not mapped. Any access to the boot params in that case will fault and silently hang the kernel at that point. It is therefore a better idea to simply ignore mdesc->boot_params in that case and give the kernel a chance to print some diagnostic on the console later. If the bootloader provides a valid pointer in r2 to the kernel then this is used instead of mdesc->boot_params, and an explicit mapping is already created in the initial MMU table for it. It is therefore a good idea to use that facility when using a relocated kernel. Signed-off-by: Nicolas Pitre Signed-off-by: Russell King --- Reading git-diff-tree failed