133 lines
4.3 KiB
Diff
133 lines
4.3 KiB
Diff
From b8f54f2cde788623f41d11327688c75aed34092f Mon Sep 17 00:00:00 2001
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From: Jonas Gorski <jogo@openwrt.org>
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Date: Mon, 20 Jun 2016 11:27:36 +0200
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Subject: [PATCH 1/2] 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
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the decompressed kernel expects it. This eliminates the need for special
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casing vmlinuz.bin appended dtb files.
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Signed-off-by: Jonas Gorski <jogo@openwrt.org>
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Cc: Kevin Cernekee <cernekee@gmail.com>
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Cc: Florian Fainelli <f.fainelli@gmail.com>
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Cc: John Crispin <john@phrozen.org>
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Cc: Paul Burton <paul.burton@imgtec.com>
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Cc: James Hogan <james.hogan@imgtec.com>
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Cc: Alban Bedel <albeu@free.fr>
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Cc: Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>
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Cc: Antony Pavlov <antonynpavlov@gmail.com>
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Cc: linux-mips@linux-mips.org
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Patchwork: https://patchwork.linux-mips.org/patch/13698/
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Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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---
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arch/mips/Kconfig | 22 ++--------------------
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arch/mips/boot/compressed/decompress.c | 17 +++++++++++++++++
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arch/mips/boot/compressed/head.S | 16 ----------------
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3 files changed, 19 insertions(+), 36 deletions(-)
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--- a/arch/mips/Kconfig
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+++ b/arch/mips/Kconfig
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@@ -2754,10 +2754,10 @@ choice
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the documented boot protocol using a device tree.
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config MIPS_RAW_APPENDED_DTB
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- bool "vmlinux.bin"
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+ bool "vmlinux.bin or vmlinuz.bin"
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help
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With this option, the boot code will look for a device tree binary
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- DTB) appended to raw vmlinux.bin (without decompressor).
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+ DTB) appended to raw vmlinux.bin or vmlinuz.bin.
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(e.g. cat vmlinux.bin <filename>.dtb > vmlinux_w_dtb).
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This is meant as a backward compatibility convenience for those
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@@ -2769,24 +2769,6 @@ choice
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look like a DTB header after a reboot if no actual DTB is appended
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to vmlinux.bin. Do not leave this option active in a production kernel
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if you don't intend to always append a DTB.
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-
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- config MIPS_ZBOOT_APPENDED_DTB
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- bool "vmlinuz.bin"
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- depends on SYS_SUPPORTS_ZBOOT
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- help
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- With this option, the boot code will look for a device tree binary
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- DTB) appended to raw vmlinuz.bin (with decompressor).
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- (e.g. cat vmlinuz.bin <filename>.dtb > vmlinuz_w_dtb).
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-
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- This is meant as a backward compatibility convenience for those
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- systems with a bootloader that can't be upgraded to accommodate
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- the documented boot protocol using a device tree.
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-
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- Beware that there is very little in terms of protection against
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- this option being confused by leftover garbage in memory that might
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- look like a DTB header after a reboot if no actual DTB is appended
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- to vmlinuz.bin. Do not leave this option active in a production kernel
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- if you don't intend to always append a DTB.
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endchoice
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choice
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--- a/arch/mips/boot/compressed/decompress.c
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+++ b/arch/mips/boot/compressed/decompress.c
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@@ -14,6 +14,7 @@
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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+#include <linux/libfdt.h>
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#include <asm/addrspace.h>
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@@ -36,6 +37,8 @@ extern void puthex(unsigned long long va
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#define puthex(val) do {} while (0)
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#endif
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+extern char __appended_dtb[];
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+
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void error(char *x)
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{
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puts("\n\n");
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@@ -114,6 +117,20 @@ void decompress_kernel(unsigned long boo
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__decompress((char *)zimage_start, zimage_size, 0, 0,
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(void *)VMLINUX_LOAD_ADDRESS_ULL, 0, 0, error);
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+ if (IS_ENABLED(CONFIG_MIPS_RAW_APPENDED_DTB) &&
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+ fdt_magic((void *)&__appended_dtb) == FDT_MAGIC) {
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+ unsigned int image_size, dtb_size;
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+
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+ dtb_size = fdt_totalsize((void *)&__appended_dtb);
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+
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+ /* last four bytes is always image size in little endian */
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+ image_size = le32_to_cpup((void *)&__image_end - 4);
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+
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+ /* copy dtb to where the booted kernel will expect it */
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+ memcpy((void *)VMLINUX_LOAD_ADDRESS_ULL + image_size,
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+ __appended_dtb, dtb_size);
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+ }
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+
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/* FIXME: should we flush cache here? */
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puts("Now, booting the kernel...\n");
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}
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--- a/arch/mips/boot/compressed/head.S
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+++ b/arch/mips/boot/compressed/head.S
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@@ -25,22 +25,6 @@ start:
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move s2, a2
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move s3, a3
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-#ifdef CONFIG_MIPS_ZBOOT_APPENDED_DTB
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- PTR_LA t0, __appended_dtb
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-#ifdef CONFIG_CPU_BIG_ENDIAN
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- li t1, 0xd00dfeed
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-#else
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- li t1, 0xedfe0dd0
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-#endif
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- lw t2, (t0)
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- bne t1, t2, not_found
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- nop
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-
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- move s1, t0
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- PTR_LI s0, -2
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-not_found:
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-#endif
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-
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/* Clear BSS */
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PTR_LA a0, _edata
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PTR_LA a2, _end
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