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MIPS: ZBOOT: copy appended dtb to the end of the kernel

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Instead of rewriting the arguments, just move the appended dtb to where
the decompressed kernel expects it. This eliminates the need for special
casing vmlinuz.bin appended dtb files.

Signed-off-by: Jonas Gorski <jogo@openwrt.org>
Cc: Kevin Cernekee <cernekee@gmail.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: John Crispin <john@phrozen.org>
Cc: Paul Burton <paul.burton@imgtec.com>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: Alban Bedel <albeu@free.fr>
Cc: Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>
Cc: Antony Pavlov <antonynpavlov@gmail.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/13698/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Jonas Gorski 2016-06-20 11:27:36 +02:00 committed by Ralf Baechle
parent 7997789461
commit b8f54f2cde
3 changed files with 19 additions and 36 deletions
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22
arch/mips/Kconfig
View File

@ -2884,10 +2884,10 @@ choice
the documented boot protocol using a device tree.
config MIPS_RAW_APPENDED_DTB
bool "vmlinux.bin"
bool "vmlinux.bin or vmlinuz.bin"
help
With this option, the boot code will look for a device tree binary
DTB) appended to raw vmlinux.bin (without decompressor).
DTB) appended to raw vmlinux.bin or vmlinuz.bin.
(e.g. cat vmlinux.bin <filename>.dtb > vmlinux_w_dtb).
This is meant as a backward compatibility convenience for those
@ -2899,24 +2899,6 @@ choice
look like a DTB header after a reboot if no actual DTB is appended
to vmlinux.bin. Do not leave this option active in a production kernel
if you don't intend to always append a DTB.
config MIPS_ZBOOT_APPENDED_DTB
bool "vmlinuz.bin"
depends on SYS_SUPPORTS_ZBOOT
help
With this option, the boot code will look for a device tree binary
DTB) appended to raw vmlinuz.bin (with decompressor).
(e.g. cat vmlinuz.bin <filename>.dtb > vmlinuz_w_dtb).
This is meant as a backward compatibility convenience for those
systems with a bootloader that can't be upgraded to accommodate
the documented boot protocol using a device tree.
Beware that there is very little in terms of protection against
this option being confused by leftover garbage in memory that might
look like a DTB header after a reboot if no actual DTB is appended
to vmlinuz.bin. Do not leave this option active in a production kernel
if you don't intend to always append a DTB.
endchoice
choice

17
arch/mips/boot/compressed/decompress.c
View File

@ -14,6 +14,7 @@
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/libfdt.h>
#include <asm/addrspace.h>
@ -36,6 +37,8 @@ extern void puthex(unsigned long long val);
#define puthex(val) do {} while (0)
#endif
extern char __appended_dtb[];
void error(char *x)
{
puts("\n\n");
@ -114,6 +117,20 @@ void decompress_kernel(unsigned long boot_heap_start)
__decompress((char *)zimage_start, zimage_size, 0, 0,
(void *)VMLINUX_LOAD_ADDRESS_ULL, 0, 0, error);
if (IS_ENABLED(CONFIG_MIPS_RAW_APPENDED_DTB) &&
fdt_magic((void *)&__appended_dtb) == FDT_MAGIC) {
unsigned int image_size, dtb_size;
dtb_size = fdt_totalsize((void *)&__appended_dtb);
/* last four bytes is always image size in little endian */
image_size = le32_to_cpup((void *)&__image_end - 4);
/* copy dtb to where the booted kernel will expect it */
memcpy((void *)VMLINUX_LOAD_ADDRESS_ULL + image_size,
__appended_dtb, dtb_size);
}
/* FIXME: should we flush cache here? */
puts("Now, booting the kernel...\n");
}

16
arch/mips/boot/compressed/head.S
View File

@ -25,22 +25,6 @@ start:
move s2, a2
move s3, a3
#ifdef CONFIG_MIPS_ZBOOT_APPENDED_DTB
PTR_LA t0, __appended_dtb
#ifdef CONFIG_CPU_BIG_ENDIAN
li t1, 0xd00dfeed
#else
li t1, 0xedfe0dd0
#endif
lw t2, (t0)
bne t1, t2, not_found
nop
move s1, t0
PTR_LI s0, -2
not_found:
#endif
/* Clear BSS */
PTR_LA a0, _edata
PTR_LA a2, _end