diff options
Diffstat (limited to 'target/linux/brcm63xx/patches-4.1/001-4.2-MIPS-Add-support-for-vmlinux.bin-appended-dtb.patch')
| -rw-r--r-- | target/linux/brcm63xx/patches-4.1/001-4.2-MIPS-Add-support-for-vmlinux.bin-appended-dtb.patch | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/target/linux/brcm63xx/patches-4.1/001-4.2-MIPS-Add-support-for-vmlinux.bin-appended-dtb.patch b/target/linux/brcm63xx/patches-4.1/001-4.2-MIPS-Add-support-for-vmlinux.bin-appended-dtb.patch new file mode 100644 index 0000000..fa7732b --- /dev/null +++ b/target/linux/brcm63xx/patches-4.1/001-4.2-MIPS-Add-support-for-vmlinux.bin-appended-dtb.patch @@ -0,0 +1,112 @@ +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 +@@ -2703,6 +2703,33 @@ 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 |