--- /dev/null
+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
projects / openwrt / openwrt.git / blobdiff