diff options
| -rw-r--r-- | disk/Kconfig | 13 | ||||
| -rw-r--r-- | disk/part_efi.c | 55 |
2 files changed, 64 insertions, 4 deletions
diff --git a/disk/Kconfig b/disk/Kconfig index 16ff52d..8e328b4 100644 --- a/disk/Kconfig +++ b/disk/Kconfig @@ -79,6 +79,19 @@ config EFI_PARTITION common when EFI is the bootloader. Note 2TB partition limit; see disk/part_efi.c +config EFI_PARTITION_ENTRIES_OFF + int "Offset (in bytes) of the EFI partition entries" + depends on EFI_PARTITION + default 0 + help + Specify an earliest location (in bytes) where the partition + entries may be located. This is meant to allow "punching a + hole into a device" to create a gap for an SPL, its payload + and the U-Boot environment. + + If unsure, leave at 0 (which will locate the partition + entries at the first possible LBA following the GPT header). + config SPL_EFI_PARTITION bool "Enable EFI GPT partition table for SPL" depends on SPL && PARTITIONS diff --git a/disk/part_efi.c b/disk/part_efi.c index db0c890..1b7ba27 100644 --- a/disk/part_efi.c +++ b/disk/part_efi.c @@ -13,11 +13,13 @@ #include <asm/unaligned.h> #include <common.h> #include <command.h> +#include <fdtdec.h> #include <ide.h> #include <inttypes.h> #include <malloc.h> #include <memalign.h> #include <part_efi.h> +#include <linux/compiler.h> #include <linux/ctype.h> DECLARE_GLOBAL_DATA_PTR; @@ -373,8 +375,8 @@ int write_gpt_table(struct blk_desc *dev_desc, if (blk_dwrite(dev_desc, 1, 1, gpt_h) != 1) goto err; - if (blk_dwrite(dev_desc, 2, pte_blk_cnt, gpt_e) - != pte_blk_cnt) + if (blk_dwrite(dev_desc, le64_to_cpu(gpt_h->partition_entry_lba), + pte_blk_cnt, gpt_e) != pte_blk_cnt) goto err; prepare_backup_gpt_header(gpt_h); @@ -498,6 +500,49 @@ int gpt_fill_pte(gpt_header *gpt_h, gpt_entry *gpt_e, return 0; } +static uint32_t partition_entries_offset(struct blk_desc *dev_desc) +{ + uint32_t offset_blks = 2; + int __maybe_unused config_offset; + +#if defined(CONFIG_EFI_PARTITION_ENTRIES_OFF) + /* + * Some architectures require their SPL loader at a fixed + * address within the first 16KB of the disk. To avoid an + * overlap with the partition entries of the EFI partition + * table, the first safe offset (in bytes, from the start of + * the disk) for the entries can be set in + * CONFIG_EFI_PARTITION_ENTRIES_OFF. + */ + offset_blks = + PAD_TO_BLOCKSIZE(CONFIG_EFI_PARTITION_ENTRIES_OFF, dev_desc); +#endif + +#if defined(CONFIG_OF_CONTROL) + /* + * Allow the offset of the first partition entires (in bytes + * from the start of the device) to be specified as a property + * of the device tree '/config' node. + */ + config_offset = fdtdec_get_config_int(gd->fdt_blob, + "u-boot,efi-partition-entries-offset", + -EINVAL); + if (config_offset != -EINVAL) + offset_blks = PAD_TO_BLOCKSIZE(config_offset, dev_desc); +#endif + + debug("efi: partition entries offset (in blocks): %d\n", offset_blks); + + /* + * The earliest LBA this can be at is LBA#2 (i.e. right behind + * the (protective) MBR and the GPT header. + */ + if (offset_blks < 2) + offset_blks = 2; + + return offset_blks; +} + int gpt_fill_header(struct blk_desc *dev_desc, gpt_header *gpt_h, char *str_guid, int parts_count) { @@ -506,9 +551,11 @@ int gpt_fill_header(struct blk_desc *dev_desc, gpt_header *gpt_h, gpt_h->header_size = cpu_to_le32(sizeof(gpt_header)); gpt_h->my_lba = cpu_to_le64(1); gpt_h->alternate_lba = cpu_to_le64(dev_desc->lba - 1); - gpt_h->first_usable_lba = cpu_to_le64(34); gpt_h->last_usable_lba = cpu_to_le64(dev_desc->lba - 34); - gpt_h->partition_entry_lba = cpu_to_le64(2); + gpt_h->partition_entry_lba = + cpu_to_le64(partition_entries_offset(dev_desc)); + gpt_h->first_usable_lba = + cpu_to_le64(le64_to_cpu(gpt_h->partition_entry_lba) + 32); gpt_h->num_partition_entries = cpu_to_le32(GPT_ENTRY_NUMBERS); gpt_h->sizeof_partition_entry = cpu_to_le32(sizeof(gpt_entry)); gpt_h->header_crc32 = 0; |