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955575c8dc
In commit e163a931af ("cmd: gpt: backup boot code before writing MBR")
there was added the procedure for storing old boot code when doing "gpt
write". But instead of storing just backup code, the whole MBR was
stored, and only specific fields were replaced further, keeping
everything else intact. That's obviously not what we want.
Fix the code to actually store only old boot code and zero out
everything else. This fixes next testing case:
=> mmc write $loadaddr 0x0 0x7b
=> gpt write mmc 1 $partitions
In case when $loadaddr address and further memory contains 0xff, the
board was bricked (ROM-code probably didn't like partition entries that
were clobbered with 0xff). With this patch applied, commands above don't
brick the board.
Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Cc: Alejandro Hernandez <ajhernandez@ti.com>
Tested-by: Andy Shevchenko <andy.shevchenko@gmail.com>
123 lines
3.4 KiB
C
123 lines
3.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright (C) 2008 RuggedCom, Inc.
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* Richard Retanubun <RichardRetanubun@RuggedCom.com>
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*/
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/*
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* See also linux/fs/partitions/efi.h
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*
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* EFI GUID Partition Table
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* Per Intel EFI Specification v1.02
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* http://developer.intel.com/technology/efi/efi.htm
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*/
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#include <linux/compiler.h>
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#ifndef _DISK_PART_EFI_H
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#define _DISK_PART_EFI_H
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#include <efi.h>
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#define MSDOS_MBR_SIGNATURE 0xAA55
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#define MSDOS_MBR_BOOT_CODE_SIZE 440
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#define EFI_PMBR_OSTYPE_EFI 0xEF
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#define EFI_PMBR_OSTYPE_EFI_GPT 0xEE
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#define GPT_HEADER_SIGNATURE 0x5452415020494645ULL
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#define GPT_HEADER_REVISION_V1 0x00010000
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#define GPT_PRIMARY_PARTITION_TABLE_LBA 1ULL
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#define GPT_ENTRY_NUMBERS CONFIG_EFI_PARTITION_ENTRIES_NUMBERS
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#define GPT_ENTRY_SIZE 128
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#define PARTITION_SYSTEM_GUID \
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EFI_GUID( 0xC12A7328, 0xF81F, 0x11d2, \
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0xBA, 0x4B, 0x00, 0xA0, 0xC9, 0x3E, 0xC9, 0x3B)
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#define LEGACY_MBR_PARTITION_GUID \
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EFI_GUID( 0x024DEE41, 0x33E7, 0x11d3, \
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0x9D, 0x69, 0x00, 0x08, 0xC7, 0x81, 0xF3, 0x9F)
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#define PARTITION_MSFT_RESERVED_GUID \
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EFI_GUID( 0xE3C9E316, 0x0B5C, 0x4DB8, \
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0x81, 0x7D, 0xF9, 0x2D, 0xF0, 0x02, 0x15, 0xAE)
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#define PARTITION_BASIC_DATA_GUID \
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EFI_GUID( 0xEBD0A0A2, 0xB9E5, 0x4433, \
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0x87, 0xC0, 0x68, 0xB6, 0xB7, 0x26, 0x99, 0xC7)
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#define PARTITION_LINUX_FILE_SYSTEM_DATA_GUID \
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EFI_GUID(0x0FC63DAF, 0x8483, 0x4772, \
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0x8E, 0x79, 0x3D, 0x69, 0xD8, 0x47, 0x7D, 0xE4)
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#define PARTITION_LINUX_RAID_GUID \
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EFI_GUID( 0xa19d880f, 0x05fc, 0x4d3b, \
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0xa0, 0x06, 0x74, 0x3f, 0x0f, 0x84, 0x91, 0x1e)
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#define PARTITION_LINUX_SWAP_GUID \
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EFI_GUID( 0x0657fd6d, 0xa4ab, 0x43c4, \
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0x84, 0xe5, 0x09, 0x33, 0xc8, 0x4b, 0x4f, 0x4f)
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#define PARTITION_LINUX_LVM_GUID \
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EFI_GUID( 0xe6d6d379, 0xf507, 0x44c2, \
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0xa2, 0x3c, 0x23, 0x8f, 0x2a, 0x3d, 0xf9, 0x28)
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/* linux/include/efi.h */
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typedef u16 efi_char16_t;
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/* based on linux/include/genhd.h */
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struct partition {
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u8 boot_ind; /* 0x80 - active */
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u8 head; /* starting head */
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u8 sector; /* starting sector */
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u8 cyl; /* starting cylinder */
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u8 sys_ind; /* What partition type */
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u8 end_head; /* end head */
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u8 end_sector; /* end sector */
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u8 end_cyl; /* end cylinder */
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__le32 start_sect; /* starting sector counting from 0 */
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__le32 nr_sects; /* nr of sectors in partition */
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} __packed;
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/* based on linux/fs/partitions/efi.h */
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typedef struct _gpt_header {
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__le64 signature;
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__le32 revision;
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__le32 header_size;
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__le32 header_crc32;
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__le32 reserved1;
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__le64 my_lba;
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__le64 alternate_lba;
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__le64 first_usable_lba;
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__le64 last_usable_lba;
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efi_guid_t disk_guid;
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__le64 partition_entry_lba;
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__le32 num_partition_entries;
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__le32 sizeof_partition_entry;
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__le32 partition_entry_array_crc32;
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} __packed gpt_header;
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typedef union _gpt_entry_attributes {
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struct {
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u64 required_to_function:1;
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u64 no_block_io_protocol:1;
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u64 legacy_bios_bootable:1;
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u64 reserved:45;
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u64 type_guid_specific:16;
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} fields;
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unsigned long long raw;
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} __packed gpt_entry_attributes;
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#define PARTNAME_SZ (72 / sizeof(efi_char16_t))
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typedef struct _gpt_entry {
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efi_guid_t partition_type_guid;
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efi_guid_t unique_partition_guid;
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__le64 starting_lba;
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__le64 ending_lba;
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gpt_entry_attributes attributes;
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efi_char16_t partition_name[PARTNAME_SZ];
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} __packed gpt_entry;
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typedef struct _legacy_mbr {
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u8 boot_code[MSDOS_MBR_BOOT_CODE_SIZE];
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__le32 unique_mbr_signature;
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__le16 unknown;
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struct partition partition_record[4];
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__le16 signature;
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} __packed legacy_mbr;
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#endif /* _DISK_PART_EFI_H */
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