mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-26 00:41:17 +00:00
113 lines
3.4 KiB
Diff
113 lines
3.4 KiB
Diff
|
From 1da8f1798e307fb8422753984339beb00025f97d Mon Sep 17 00:00:00 2001
|
||
|
|
From: Jonas Gorski <jogo@openwrt.org>
|
||
|
|
Date: Sun, 12 Apr 2015 12:24:58 +0200
|
||
|
|
Subject: [PATCH] MIPS: Add support for vmlinux.bin appended dtb
|
||
|
|
|
||
|
|
Add support for detecting a vmlinux.bin appended dtb and overriding
|
||
|
|
the boot arguments to match the UHI interface.
|
||
|
|
|
||
|
|
Due to the PERCPU section being empty for !SMP, but still modifying
|
||
|
|
the current address by aligning it to the page size, do not define
|
||
|
|
it for !SMP builds to allow __appended_dtb to still point to
|
||
|
|
the actual end of the data.
|
||
|
|
|
||
|
|
Signed-off-by: Jonas Gorski <jogo@openwrt.org>
|
||
|
|
Cc: linux-mips@linux-mips.org
|
||
|
|
Cc: devicetree@vger.kernel.org
|
||
|
|
Cc: John Crispin <blogic@openwrt.org>
|
||
|
|
Cc: Kevin Cernekee <cernekee@gmail.com>
|
||
|
|
Cc: Florian Fainelli <f.fainelli@gmail.com>
|
||
|
|
Cc: Aaro Koskinen <aaro.koskinen@iki.fi>
|
||
|
|
Cc: Markos Chandras <markos.chandras@imgtec.com>
|
||
|
|
Cc: Andrew Bresticker <abrestic@chromium.org>
|
||
|
|
Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
|
||
|
|
Cc: Paul Burton <paul.burton@imgtec.com>
|
||
|
|
Cc: James Hartley <James.Hartley@imgtec.com>
|
||
|
|
Patchwork: https://patchwork.linux-mips.org/patch/9739/
|
||
|
|
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
|
||
|
|
---
|
||
|
|
arch/mips/Kconfig | 27 +++++++++++++++++++++++++++
|
||
|
|
arch/mips/kernel/head.S | 16 ++++++++++++++++
|
||
|
|
arch/mips/kernel/vmlinux.lds.S | 8 +++++++-
|
||
|
|
3 files changed, 50 insertions(+), 1 deletion(-)
|
||
|
|
|
||
|
|
--- a/arch/mips/Kconfig
|
||
|
|
+++ b/arch/mips/Kconfig
|
||
|
|
@@ -2702,6 +2702,33 @@ config BOOT_RAW
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
+choice
|
||
|
|
+ prompt "Kernel appended dtb support" if OF
|
||
|
|
+ default MIPS_NO_APPENDED_DTB
|
||
|
|
+
|
||
|
|
+ config MIPS_NO_APPENDED_DTB
|
||
|
|
+ bool "None"
|
||
|
|
+ help
|
||
|
|
+ Do not enable appended dtb support.
|
||
|
|
+
|
||
|
|
+ config MIPS_RAW_APPENDED_DTB
|
||
|
|
+ bool "vmlinux.bin"
|
||
|
|
+ help
|
||
|
|
+ With this option, the boot code will look for a device tree binary
|
||
|
|
+ DTB) appended to raw vmlinux.bin (without decompressor).
|
||
|
|
+ (e.g. cat vmlinux.bin <filename>.dtb > vmlinux_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 vmlinux.bin. Do not leave this option active in a production kernel
|
||
|
|
+ if you don't intend to always append a DTB.
|
||
|
|
+endchoice
|
||
|
|
+
|
||
|
|
endmenu
|
||
|
|
|
||
|
|
config LOCKDEP_SUPPORT
|
||
|
|
--- a/arch/mips/kernel/head.S
|
||
|
|
+++ b/arch/mips/kernel/head.S
|
||
|
|
@@ -100,6 +100,22 @@ NESTED(kernel_entry, 16, sp) # kernel
|
||
|
|
jr t0
|
||
|
|
0:
|
||
|
|
|
||
|
|
+#ifdef CONFIG_MIPS_RAW_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 a1, t0
|
||
|
|
+ PTR_LI a0, -2
|
||
|
|
+not_found:
|
||
|
|
+#endif
|
||
|
|
PTR_LA t0, __bss_start # clear .bss
|
||
|
|
LONG_S zero, (t0)
|
||
|
|
PTR_LA t1, __bss_stop - LONGSIZE
|
||
|
|
--- a/arch/mips/kernel/vmlinux.lds.S
|
||
|
|
+++ b/arch/mips/kernel/vmlinux.lds.S
|
||
|
|
@@ -125,8 +125,14 @@ SECTIONS
|
||
|
|
.exit.data : {
|
||
|
|
EXIT_DATA
|
||
|
|
}
|
||
|
|
-
|
||
|
|
+#ifdef CONFIG_SMP
|
||
|
|
PERCPU_SECTION(1 << CONFIG_MIPS_L1_CACHE_SHIFT)
|
||
|
|
+#endif
|
||
|
|
+#ifdef CONFIG_MIPS_RAW_APPENDED_DTB
|
||
|
|
+ __appended_dtb = .;
|
||
|
|
+ /* leave space for appended DTB */
|
||
|
|
+ . += 0x100000;
|
||
|
|
+#endif
|
||
|
|
/*
|
||
|
|
* Align to 64K in attempt to eliminate holes before the
|
||
|
|
* .bss..swapper_pg_dir section at the start of .bss. This
|