MIPS: bootm: prepare a flattened device tree for the kernel
Add the initial code to prepare a flattened device tree for
the kernel like relocating the FDT blob and fixing up the
/chosen and /memory nodes.
The final hand over to the kernel is not yet implemented. After
the community agreed on the MIPS boot interface for device trees,
the corresponding code will be added.
Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 9b3ecea..363f5ac 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -136,6 +136,17 @@
address and size will be prepared as zero-terminated key/value list.
The address of the enviroment is stored in register $a2.
+config MIPS_BOOT_FDT
+ bool "Hand over a flattened device tree to Linux kernel (INCOMPLETE)"
+ default n
+ help
+ Enable this option if you want U-Boot to hand over a flattened
+ device tree to the kernel.
+
+ Note: the final hand over to the kernel is not yet implemented. After
+ the community agreed on the MIPS boot interface for device trees,
+ the corresponding code will be added.
+
endmenu
config SUPPORTS_BIG_ENDIAN
diff --git a/arch/mips/lib/bootm.c b/arch/mips/lib/bootm.c
index 7a98f15..426f68a 100644
--- a/arch/mips/lib/bootm.c
+++ b/arch/mips/lib/bootm.c
@@ -7,6 +7,7 @@
#include <common.h>
#include <image.h>
+#include <fdt_support.h>
#include <asm/addrspace.h>
DECLARE_GLOBAL_DATA_PTR;
@@ -72,9 +73,39 @@
if (ret)
return ret;
+#if defined(CONFIG_MIPS_BOOT_FDT) && defined(CONFIG_OF_LIBFDT)
+ if (images->ft_len) {
+ boot_fdt_add_mem_rsv_regions(&images->lmb, images->ft_addr);
+
+ ret = boot_relocate_fdt(&images->lmb, &images->ft_addr,
+ &images->ft_len);
+ if (ret)
+ return ret;
+ }
+#endif
+
return 0;
}
+static void boot_setup_fdt(bootm_headers_t *images)
+{
+#if defined(CONFIG_MIPS_BOOT_FDT) && defined(CONFIG_OF_LIBFDT)
+ u64 mem_start = 0;
+ u64 mem_size = gd->ram_size;
+
+ debug("## setup FDT\n");
+
+ fdt_chosen(images->ft_addr, 1);
+ fdt_fixup_memory_banks(images->ft_addr, &mem_start, &mem_size, 1);
+ fdt_fixup_ethernet(images->ft_addr);
+ fdt_initrd(images->ft_addr, images->initrd_start, images->initrd_end, 1);
+
+#if defined(CONFIG_OF_BOARD_SETUP)
+ ft_board_setup(images->ft_addr, gd->bd);
+#endif
+#endif
+}
+
static void linux_cmdline_init(void)
{
linux_argc = 1;
@@ -168,7 +199,7 @@
static void boot_cmdline_linux(bootm_headers_t *images)
{
- if (mips_boot_cmdline_legacy) {
+ if (mips_boot_cmdline_legacy && !images->ft_len) {
linux_cmdline_legacy(images);
if (!mips_boot_env_legacy)
@@ -259,8 +290,11 @@
static void boot_prep_linux(bootm_headers_t *images)
{
- if (mips_boot_env_legacy)
+ if (mips_boot_env_legacy && !images->ft_len)
linux_env_legacy(images);
+
+ if (images->ft_len)
+ boot_setup_fdt(images);
}
static void boot_jump_linux(bootm_headers_t *images)