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MIPS: bootm: prepare a flattened device tree for the kernel

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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>
This commit is contained in:
Daniel Schwierzeck 2015-01-14 21:44:13 +01:00
parent 8cec725ad5
commit 5002d8cc54
2 changed files with 47 additions and 2 deletions
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11
arch/mips/Kconfig
View File

@ -136,6 +136,17 @@ config MIPS_BOOT_ENV_LEGACY
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

38
arch/mips/lib/bootm.c
View File

@ -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 @@ static int boot_setup_linux(bootm_headers_t *images)
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 linux_cmdline_append(bootm_headers_t *images)
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 linux_env_legacy(bootm_headers_t *images)
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)