From: Michael Ellerman Date: Thu, 28 Aug 2014 08:40:47 +0000 (+1000) Subject: powerpc: Check flat device tree version at boot X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=ad72a279a2b874828d1b5070ef01cf6ee6b1d62c;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git powerpc: Check flat device tree version at boot In commit e6a6928c3ea1 "of/fdt: Convert FDT functions to use libfdt", the kernel stopped supporting old flat device tree formats. The minimum supported version is now 0x10. There was a checking function added, early_init_dt_verify(), but it's not called on powerpc. The result is, if you boot with an old flat device tree, the kernel will fail to parse it correctly, think you have no memory etc. and hilarity ensues. We can't really fix it, but we can at least catch the fact that the device tree is in an unsupported format and panic(). We can't call BUG(), it's too early. Signed-off-by: Michael Ellerman --- diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c index cb35c5b3efca..59576255d22b 100644 --- a/arch/powerpc/kernel/prom.c +++ b/arch/powerpc/kernel/prom.c @@ -642,6 +642,10 @@ void __init early_init_devtree(void *params) DBG(" -> early_init_devtree(%p)\n", params); + /* Too early to BUG_ON(), do it by hand */ + if (!early_init_dt_verify(params)) + panic("BUG: Failed verifying flat device tree, bad version?"); + /* Setup flat device-tree pointer */ initial_boot_params = params;