From 5002d8cc54f5be2230c4ccf60448e8720444671c Mon Sep 17 00:00:00 2001 From: Daniel Schwierzeck Date: Wed, 14 Jan 2015 21:44:13 +0100 Subject: [PATCH] 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 --- arch/mips/Kconfig | 11 +++++++++++ arch/mips/lib/bootm.c | 38 ++++++++++++++++++++++++++++++++++++-- 2 files changed, 47 insertions(+), 2 deletions(-) diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index 9b3ecea377..363f5ac818 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -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 diff --git a/arch/mips/lib/bootm.c b/arch/mips/lib/bootm.c index 7a98f15131..426f68a990 100644 --- a/arch/mips/lib/bootm.c +++ b/arch/mips/lib/bootm.c @@ -7,6 +7,7 @@ #include #include +#include #include 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) -- 2.25.1