From 390cbb56a731546edc0f35fbc4c5045676467581 Mon Sep 17 00:00:00 2001 From: Paul Mackerras Date: Fri, 13 Apr 2007 10:46:21 +1000 Subject: [PATCH] [POWERPC] Fix detection of loader-supplied initrd on OF platforms Commit 79c8541924a220964f9f2cbed31eaa9fdb042eab introduced code to move the initrd if it was in a place where it would get overwritten by the kernel image. Unfortunately this exposed the fact that the code that checks whether the values passed in r3 and r4 are intended to indicate the start address and size of an initrd image was not as thorough as the kernel's checks. The symptom is that on OF-based platforms, the bootwrapper can cause an exception which causes the system to drop back into OF. Previously it didn't matter so much if the code incorrectly thought that there was an initrd, since the values for start and size were just passed through to the kernel. Now the bootwrapper needs to apply the same checks as the kernel since it is now using the initrd data itself (in the process of copying it if necessary). This adds the code to do that. Signed-off-by: Paul Mackerras --- arch/powerpc/boot/of.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/boot/of.c b/arch/powerpc/boot/of.c index 2cec5c17fb..8fb42b63ec 100644 --- a/arch/powerpc/boot/of.c +++ b/arch/powerpc/boot/of.c @@ -282,6 +282,8 @@ void platform_init(unsigned long a1, unsigned long a2, void *promptr) prom = (int (*)(void *))promptr; loader_info.promptr = promptr; - loader_info.initrd_addr = a1; - loader_info.initrd_size = a2; + if (a1 && a2 && a2 != 0xdeadbeef) { + loader_info.initrd_addr = a1; + loader_info.initrd_size = a2; + } } -- 2.39.5