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MIPS: boot/compressed: Copy DTB to aligned address

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Since 5.12-rc1, the Device Tree blob must now be properly aligned.

Therefore, the decompress routine must be careful to copy the blob at
the next aligned address after the kernel image.

This commit fixes the kernel sometimes not booting with a Device Tree
blob appended to it.

Fixes: 79edff1206 ("scripts/dtc: Update to upstream version v1.6.0-51-g183df9e9c2b9")
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
This commit is contained in:
Paul Cercueil 2021-03-03 19:33:05 +00:00 committed by Thomas Bogendoerfer
parent a38fd87484
commit 7a05293af3
2 changed files with 10 additions and 0 deletions
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8
arch/mips/boot/compressed/decompress.c
View File

@ -14,6 +14,7 @@
#include <asm/addrspace.h>
#include <asm/unaligned.h>
#include <asm-generic/vmlinux.lds.h>
/*
* These two variables specify the free mem region
@ -120,6 +121,13 @@ void decompress_kernel(unsigned long boot_heap_start)
/* last four bytes is always image size in little endian */
image_size = get_unaligned_le32((void *)&__image_end - 4);
/* The device tree's address must be properly aligned */
image_size = ALIGN(image_size, STRUCT_ALIGNMENT);
puts("Copy device tree to address ");
puthex(VMLINUX_LOAD_ADDRESS_ULL + image_size);
puts("\n");
/* copy dtb to where the booted kernel will expect it */
memcpy((void *)VMLINUX_LOAD_ADDRESS_ULL + image_size,
__appended_dtb, dtb_size);

2
arch/mips/kernel/vmlinux.lds.S
View File

@ -145,6 +145,7 @@ SECTIONS
}
#ifdef CONFIG_MIPS_ELF_APPENDED_DTB
STRUCT_ALIGN();
.appended_dtb : AT(ADDR(.appended_dtb) - LOAD_OFFSET) {
*(.appended_dtb)
KEEP(*(.appended_dtb))
@ -172,6 +173,7 @@ SECTIONS
#endif
#ifdef CONFIG_MIPS_RAW_APPENDED_DTB
STRUCT_ALIGN();
__appended_dtb = .;
/* leave space for appended DTB */
. += 0x100000;