MIPS: vmlinux: create a section for appended DTB

For bootloaders that support booting only ELF kernels and load only ELF
segments to memory there is no easy way to supply DTB without kernel
recompilation. For that purpose, create a section called .appended_dtb
that can be later updated with board-specific DTB using binutils e.g. at
kernel installation time.

Signed-off-by: Aaro Koskinen <aaro.koskinen@nokia.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/11114/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 218aa67..71683a8 100644 (file)
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -2736,6 +2736,20 @@ choice
                help
                  Do not enable appended dtb support.
 
+       config MIPS_ELF_APPENDED_DTB
+               bool "vmlinux"
+               help
+                 With this option, the boot code will look for a device tree binary
+                 DTB) included in the vmlinux ELF section .appended_dtb. By default
+                 it is empty and the DTB can be appended using binutils command
+                 objcopy:
+
+                   objcopy --update-section .appended_dtb=<filename>.dtb vmlinux
+
+                 This is meant as a backward compatiblity convenience for those
+                 systems with a bootloader that can't be upgraded to accommodate
+                 the documented boot protocol using a device tree.
+
        config MIPS_RAW_APPENDED_DTB
                bool "vmlinux.bin"
                help

diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index 6f142ee..66aac55 100644 (file)
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -39,6 +39,10 @@
 #include <asm/smp-ops.h>
 #include <asm/prom.h>
 
+#ifdef CONFIG_MIPS_ELF_APPENDED_DTB
+const char __section(.appended_dtb) __appended_dtb[0x100000];
+#endif /* CONFIG_MIPS_ELF_APPENDED_DTB */
+
 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
 
 EXPORT_SYMBOL(cpu_data);

diff --git a/arch/mips/kernel/vmlinux.lds.S b/arch/mips/kernel/vmlinux.lds.S
index 07d32a4..f4c23d9 100644 (file)
--- a/arch/mips/kernel/vmlinux.lds.S
+++ b/arch/mips/kernel/vmlinux.lds.S
@@ -132,6 +132,11 @@ SECTIONS
        __appended_dtb = .;
        /* leave space for appended DTB */
        . += 0x100000;
+#elif defined(CONFIG_MIPS_ELF_APPENDED_DTB)
+       .appended_dtb : AT(ADDR(.appended_dtb) - LOAD_OFFSET) {
+               *(.appended_dtb)
+               KEEP(*(.appended_dtb))
+       }
 #endif
        /*
         * Align to 64K in attempt to eliminate holes before the