e84839932a
Extends the emmc_server payload to access the eMMC hardware boot
partitions (boot0/boot1) that hold the Tegra T124 BCT and low-level
bootloader — data not captured in the existing NAND dump.
Payload changes (emmc_server.c / emmc_server.h):
- Add MMC_CMD6 (SWITCH, R1b) for EXT_CSD partition switching
- Add switch_partition_access() to set EXT_CSD[179] PARTITION_CONFIG
- EMMC_CMD_READ and EMMC_CMD_WRITE now decode high 2 bits of
start_sector to select the target partition without new op codes:
0x80000000|sector -> boot0, 0xC0000000|sector -> boot1
Partition is restored to UDA after each operation.
New script (dump_boot_partitions.py):
- Reads EXT_CSD BOOT_SIZE_MULT to determine exact partition size
- Dumps jibo_work/emmc_boot0.bin and jibo_work/emmc_boot1.bin
- Works with the existing shofel2_t124 EMMC_READ command unchanged
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
45 lines
1.4 KiB
C
45 lines
1.4 KiB
C
#ifndef _EMMC_SERVER_H_
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#define _EMMC_SERVER_H_
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#if __arm__
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typedef u32 uint32_t;
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#else
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#include <stdint.h>
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#endif
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/* eMMC server protocol commands */
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#define EMMC_CMD_READ 0x01
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#define EMMC_CMD_WRITE 0x02
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#define EMMC_CMD_STATUS 0x03
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#define EMMC_CMD_READ_EXT_CSD 0x04 /* Read 512-byte EXT_CSD register for chip health */
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#define EMMC_CMD_ERASE 0x05 /* Erase a range of sectors (forces reallocation) */
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#define EMMC_CMD_EXIT 0xFF
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/* Boot partition encoding for EMMC_CMD_READ / EMMC_CMD_WRITE start_sector:
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* 0x00000000 | sector -> User Data Area (normal)
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* 0x80000000 | sector -> Boot Partition 1 (boot0)
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* 0xC0000000 | sector -> Boot Partition 2 (boot1)
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* The payload switches the eMMC partition, performs the I/O, then restores UDA.
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* Use sector=0 and num_sectors=boot_size_sectors to dump an entire boot partition.
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*/
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#define EMMC_BOOT0_BASE 0x80000000U
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#define EMMC_BOOT1_BASE 0xC0000000U
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/* Transfer chunk sizes: sectors per USB transfer.
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* Both read and write now use 8-sector (4 KB) chunks via CMD18/CMD25.
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*/
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#define EMMC_CHUNK_SECTORS_READ 8
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#define EMMC_CHUNK_SECTORS_WRITE 8
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#define EMMC_CHUNK_SECTORS 8
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#define EMMC_SECTOR_SIZE 512
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#define EMMC_CHUNK_BYTES (EMMC_CHUNK_SECTORS * EMMC_SECTOR_SIZE)
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/* Command structure sent from PC to payload */
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struct emmc_cmd_s {
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uint32_t op;
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uint32_t start_sector;
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uint32_t num_sectors;
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};
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#endif
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