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linux/arch/arm64/include/asm/boot.h

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arm64: use fixmap region for permanent FDT mapping Currently, the FDT blob needs to be in the same 512 MB region as the kernel, so that it can be mapped into the kernel virtual memory space very early on using a minimal set of statically allocated translation tables. Now that we have early fixmap support, we can relax this restriction, by moving the permanent FDT mapping to the fixmap region instead. This way, the FDT blob may be anywhere in memory. This also moves the vetting of the FDT to mmu.c, since the early init code in head.S does not handle mapping of the FDT anymore. At the same time, fix up some comments in head.S that have gone stale. Reviewed-by: Mark Rutland <mark.rutland@arm.com> Tested-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2015-06-01 19:40:32 +08:00
#ifndef __ASM_BOOT_H
#define __ASM_BOOT_H
#include <asm/sizes.h>
/*
* arm64 requires the DTB to be 8 byte aligned and
* not exceed 2MB in size.
*/
#define MIN_FDT_ALIGN 8
#define MAX_FDT_SIZE SZ_2M
#endif