eMMC Boot Partition Size

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Boot Partition

eMMC上有2个Boot Partition，最小为128BK，最大为128KB * BOOT_SIZE_MULT，BOOT_SIZE_MULT的值在ECSD寄存器第226个字节定义。Boot Partition和User Area是物理分开的。
分区信息

启动分区选择

boot配置在EXT_CSD寄存器第179个字节定义，可以设置BOOT_PARTITION_ENABLE位的值来选择从Boot Partition或者User Area分区启动。关于第179字节的定义如下：
179字节定义

设置Boot Partition大小

可知，Boot Partition大小范围为：128KB ~ 31.875MB
大小

mmc工具的使用

mmc-utils工具是用于在linux下用户层访问mmc设备的工具。其详细用法如下：

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Usage:
    mmc extcsd read <device>
            Print extcsd data from <device>.
    mmc writeprotect boot get <device>
            Print the boot partitions write protect status for <device>.
    mmc writeprotect boot set <device>
            Set the boot partitions write protect status for <device>.
            This sets the eMMC boot partitions to be write-protected until
            the next boot.
    mmc writeprotect user set <type><start block><blocks><device>
            Set the write protect configuration for the specified region
            of the user area for <device>.
            <type> must be "none|temp|pwron".
                "none"  - Clear temporary write protection.
                "temp"  - Set temporary write protection.
                "pwron" - Set write protection until the next poweron.
            <start block> specifies the first block of the protected area.
            <blocks> specifies the size of the protected area in blocks.
            NOTE! The area must start and end on Write Protect Group
            boundries, Use the "writeprotect user get" command to get the
            Write Protect Group size.
    mmc writeprotect user get <device>
            Print the user areas write protect configuration for <device>.
    mmc disable 512B emulation <device>
            Set the eMMC data sector size to 4KB by disabling emulation on
            <device>.
    mmc gp create <-y|-n|-c> <length KiB> <partition> <enh_attr> <ext_attr> <device>
            Create general purpose partition for the <device>.
            Dry-run only unless -y or -c is passed.
            Use -c if more partitioning settings are still to come.
            NOTE!  This is a one-time programmable (unreversible) change.
            To set enhanced attribute to general partition being created set
             <enh_attr> to 1 else set it to 0.
            To set extended attribute to general partition
             set <ext_attr> to 1,2 else set it to 0
    mmc enh_area set <-y|-n|-c> <start KiB> <length KiB> <device>
            Enable the enhanced user area for the <device>.
            Dry-run only unless -y or -c is passed.
            Use -c if more partitioning settings are still to come.
            NOTE!  This is a one-time programmable (unreversible) change.
    mmc write_reliability set <-y|-n|-c> <partition> <device>
            Enable write reliability per partition for the <device>.
            Dry-run only unless -y or -c is passed.
            Use -c if more partitioning settings are still to come.
            NOTE!  This is a one-time programmable (unreversible) change.
    mmc status get <device>
            Print the response to STATUS_SEND (CMD13).
    mmc bootpart enable <boot_partition> <send_ack> <device>
            Enable the boot partition for the <device>.
            Disable the boot partition for the <device> if <boot_partition> is set to 0.
            To receive acknowledgment of boot from the card set <send_ack>
            to 1, else set it to 0.
    mmc bootbus set <boot_mode> <reset_boot_bus_conditions> <boot_bus_width> <device>
            Set Boot Bus Conditions.
            <boot_mode> must be "single_backward|single_hs|dual"
            <reset_boot_bus_conditions> must be "x1|retain"
            <boot_bus_width> must be "x1|x4|x8"
    mmc bkops enable <device>
            Enable the eMMC BKOPS feature on <device>.
            NOTE!  This is a one-time programmable (unreversible) change.
    mmc hwreset enable <device>
            Permanently enable the eMMC H/W Reset feature on <device>.
            NOTE!  This is a one-time programmable (unreversible) change.
    mmc hwreset disable <device>
            Permanently disable the eMMC H/W Reset feature on <device>.
            NOTE!  This is a one-time programmable (unreversible) change.
    mmc sanitize <device>
            Send Sanitize command to the <device>.
            This will delete the unmapped memory region of the device.
    mmc rpmb write-key <rpmb device> <key file>
            Program authentication key which is 32 bytes length and stored
            in the specified file. Also you can specify '-' instead of
            key file path to read the key from stdin.
            NOTE!  This is a one-time programmable (unreversible) change.
            Example:
              $ echo -n AAAABBBBCCCCDDDDEEEEFFFFGGGGHHHH | \
                mmc rpmb write-key /dev/mmcblk0rpmb -
    mmc rpmb read-counter <rpmb device>
            Counter value for the <rpmb device> will be read to stdout.
    mmc rpmb read-block <rpmb device> <address> <blocks count> <output file> [key file]
            Blocks of 256 bytes will be read from <rpmb device> to output
            file or stdout if '-' is specified. If key is specified - read
            data will be verified. Instead of regular path you can specify
            '-' to read key from stdin.
            Example:
              $ echo -n AAAABBBBCCCCDDDDEEEEFFFFGGGGHHHH | \
                mmc rpmb read-block /dev/mmcblk0rpmb 0x02 2 /tmp/block -
            or read two blocks without verification
              $ mmc rpmb read-block /dev/mmcblk0rpmb 0x02 2 /tmp/block
    mmc rpmb write-block <rpmb device> <address> <256 byte data file> <key file>
            Block of 256 bytes will be written from data file to
            <rpmb device>. Also you can specify '-' instead of key
            file path or data file to read the data from stdin.
            Example:
              $ (awk 'BEGIN {while (c++<256) printf "a"}' | \
                echo -n AAAABBBBCCCCDDDDEEEEFFFFGGGGHHHH) | \
                mmc rpmb write-block /dev/mmcblk0rpmb 0x02 - -
    mmc cache enable <device>
            Enable the eMMC cache feature on <device>.
            NOTE! The cache is an optional feature on devices >= eMMC4.5.
    mmc cache disable <device>
            Disable the eMMC cache feature on <device>.
            NOTE! The cache is an optional feature on devices >= eMMC4.5.
    mmc csd read <device path>
            Print CSD data from <device path>.
            The device path should specify the csd file directory.
    mmc cid read <device path>
            Print CID data from <device path>.
            The device path should specify the cid file directory.
    mmc scr read <device path>
            Print SCR data from <device path>.
            The device path should specify the scr file directory.
    mmc ffu <image name> <device>
            Run Field Firmware Update with <image name> on <device>.

    mmc cmd42 <password> <parameter> <device>
            Usage: mmc cmd42 <password> <s|c|l|u|e> <device>
            s       set password
            c       clear password
            l       lock
            sl      set password and lock
            u       unlock
            e       force erase


    mmc help|--help|-h
            Show the help.

    mmc <cmd> --help
            Show detailed help for a command or subset of commands.

mmc读取ECSD寄存器的值

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=============================================
  Extended CSD rev 1.8 (MMC 5.1)
=============================================

Card Supported Command sets [S_CMD_SET: 0x01]
HPI Features [HPI_FEATURE: 0x01]: implementation based on CMD13
Background operations support [BKOPS_SUPPORT: 0x01]
Max Packet Read Cmd [MAX_PACKED_READS: 0x00]
Max Packet Write Cmd [MAX_PACKED_WRITES: 0x00]
Data TAG support [DATA_TAG_SUPPORT: 0x01]
Data TAG Unit Size [TAG_UNIT_SIZE: 0x03]
Tag Resources Size [TAG_RES_SIZE: 0x00]
Context Management Capabilities [CONTEXT_CAPABILITIES: 0x05]
Large Unit Size [LARGE_UNIT_SIZE_M1: 0x03]
Extended partition attribute support [EXT_SUPPORT: 0x03]
Generic CMD6 Timer [GENERIC_CMD6_TIME: 0x0a]
Power off notification [POWER_OFF_LONG_TIME: 0x32]
Cache Size [CACHE_SIZE] is 512 KiB
Background operations status [BKOPS_STATUS: 0x00]
1st Initialisation Time after programmed sector [INI_TIMEOUT_AP: 0x0a]
Power class for 52MHz, DDR at 3.6V [PWR_CL_DDR_52_360: 0x00]
Power class for 52MHz, DDR at 1.95V [PWR_CL_DDR_52_195: 0x00]
Power class for 200MHz at 3.6V [PWR_CL_200_360: 0x00]
Power class for 200MHz, at 1.95V [PWR_CL_200_195: 0x00]
Minimum Performance for 8bit at 52MHz in DDR mode:
[MIN_PERF_DDR_W_8_52: 0x00]
[MIN_PERF_DDR_R_8_52: 0x00]
TRIM Multiplier [TRIM_MULT: 0x01]
Secure Feature support [SEC_FEATURE_SUPPORT: 0x51]
Boot Information [BOOT_INFO: 0x07]
Device supports alternative boot method
Device supports dual data rate during boot
Device supports high speed timing during boot
Boot partition size [BOOT_SIZE_MULTI: 0xfc]
Access size [ACC_SIZE: 0x00]
High-capacity erase unit size [HC_ERASE_GRP_SIZE: 0x01]
i.e. 512 KiB
High-capacity erase timeout [ERASE_TIMEOUT_MULT: 0x01]
Reliable write sector count [REL_WR_SEC_C: 0x01]
High-capacity W protect group size [HC_WP_GRP_SIZE: 0x10]
i.e. 8192 KiB
Sleep current (VCC) [S_C_VCC: 0x00]
Sleep current (VCCQ) [S_C_VCCQ: 0x00]
Sleep/awake timeout [S_A_TIMEOUT: 0x14]
Sector Count [SEC_COUNT: 0x00e90000]
Device is block-addressed
Minimum Write Performance for 8bit:
[MIN_PERF_W_8_52: 0x00]
[MIN_PERF_R_8_52: 0x00]
[MIN_PERF_W_8_26_4_52: 0x00]
[MIN_PERF_R_8_26_4_52: 0x00]
Minimum Write Performance for 4bit:
[MIN_PERF_W_4_26: 0x00]
[MIN_PERF_R_4_26: 0x00]
Power classes registers:
[PWR_CL_26_360: 0x00]
[PWR_CL_52_360: 0x00]
[PWR_CL_26_195: 0x00]
[PWR_CL_52_195: 0x00]
Partition switching timing [PARTITION_SWITCH_TIME: 0x01]
Out-of-interrupt busy timing [OUT_OF_INTERRUPT_TIME: 0x0f]
I/O Driver Strength [DRIVER_STRENGTH: 0x1f]
Card Type [CARD_TYPE: 0x57]
HS200 Single Data Rate eMMC @200MHz 1.8VI/O
HS Dual Data Rate eMMC @52MHz 1.8V or 3VI/O
HS eMMC @52MHz - at rated device voltage(s)
HS eMMC @26MHz - at rated device voltage(s)
CSD structure version [CSD_STRUCTURE: 0x02]
Command set [CMD_SET: 0x00]
Command set revision [CMD_SET_REV: 0x00]
Power class [POWER_CLASS: 0x00]
High-speed interface timing [HS_TIMING: 0x02]
Erased memory content [ERASED_MEM_CONT: 0x00]
Boot configuration bytes [PARTITION_CONFIG: 0x78]
User Area Enabled for boot
No access to boot partition
Boot config protection [BOOT_CONFIG_PROT: 0x00]
Boot bus Conditions [BOOT_BUS_CONDITIONS: 0x00]
High-density erase group definition [ERASE_GROUP_DEF: 0x01]
Boot write protection status registers [BOOT_WP_STATUS]: 0x00
Boot Area Write protection [BOOT_WP]: 0x00
Power ro locking: possible
Permanent ro locking: possible
ro lock status: not locked
User area write protection register [USER_WP]: 0x00
FW configuration [FW_CONFIG]: 0x00
RPMB Size [RPMB_SIZE_MULT]: 0x20
Write reliability setting register [WR_REL_SET]: 0x1f
user area: the device protects existing data if a power failure occurs during a write operation
partition 1: the device protects existing data if a power failure occurs during a write operation
partition 2: the device protects existing data if a power failure occurs during a write operation
partition 3: the device protects existing data if a power failure occurs during a write operation
partition 4: the device protects existing data if a power failure occurs during a write operation
Write reliability parameter register [WR_REL_PARAM]: 0x15
Device supports writing EXT_CSD_WR_REL_SET
Device supports the enhanced def. of reliable write
Enable background operations handshake [BKOPS_EN]: 0x00
H/W reset function [RST_N_FUNCTION]: 0x00
HPI management [HPI_MGMT]: 0x01
Partitioning Support [PARTITIONING_SUPPORT]: 0x07
Device support partitioning feature
Device can have enhanced tech.
Max Enhanced Area Size [MAX_ENH_SIZE_MULT]: 0x0001c9
i.e. 3743744 KiB
Partitions attribute [PARTITIONS_ATTRIBUTE]: 0x00
Partitioning Setting [PARTITION_SETTING_COMPLETED]: 0x00
Device partition setting NOT complete
General Purpose Partition Size
[GP_SIZE_MULT_4]: 0x000000
[GP_SIZE_MULT_3]: 0x000000
[GP_SIZE_MULT_2]: 0x000000
[GP_SIZE_MULT_1]: 0x000000
Enhanced User Data Area Size [ENH_SIZE_MULT]: 0x000000
i.e. 0 KiB
Enhanced User Data Start Address [ENH_START_ADDR]: 0x00000000
i.e. 0 bytes offset
Bad Block Management mode [SEC_BAD_BLK_MGMNT]: 0x00
Periodic Wake-up [PERIODIC_WAKEUP]: 0x00
Program CID/CSD in DDR mode support [PROGRAM_CID_CSD_DDR_SUPPORT]: 0x01
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[127]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[126]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[125]]: 0xfc
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[124]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[123]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[122]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[121]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[120]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[119]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[118]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[117]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[116]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[115]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[114]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[113]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[112]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[111]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[110]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[109]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[108]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[107]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[106]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[105]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[104]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[103]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[102]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[101]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[100]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[99]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[98]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[97]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[96]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[95]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[94]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[93]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[92]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[91]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[90]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[89]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[88]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[87]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[86]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[85]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[84]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[83]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[82]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[81]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[80]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[79]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[78]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[77]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[76]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[75]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[74]]: 0x01
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[73]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[72]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[71]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[70]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[69]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[68]]: 0x01
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[67]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[66]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[65]]: 0x00
Vendor Specific Fields [VENDOR_SPECIFIC_FIELD[64]]: 0x00
Native sector size [NATIVE_SECTOR_SIZE]: 0x00
Sector size emulation [USE_NATIVE_SECTOR]: 0x00
Sector size [DATA_SECTOR_SIZE]: 0x00
1st initialization after disabling sector size emulation [INI_TIMEOUT_EMU]: 0x00
Class 6 commands control [CLASS_6_CTRL]: 0x00
Number of addressed group to be Released[DYNCAP_NEEDED]: 0x00
Exception events control [EXCEPTION_EVENTS_CTRL]: 0x0000
Exception events status[EXCEPTION_EVENTS_STATUS]: 0x0000
Extended Partitions Attribute [EXT_PARTITIONS_ATTRIBUTE]: 0x0000
Context configuration [CONTEXT_CONF[51]]: 0x00
Context configuration [CONTEXT_CONF[50]]: 0x00
Context configuration [CONTEXT_CONF[49]]: 0x00
Context configuration [CONTEXT_CONF[48]]: 0x00
Context configuration [CONTEXT_CONF[47]]: 0x00
Context configuration [CONTEXT_CONF[46]]: 0x00
Context configuration [CONTEXT_CONF[45]]: 0x00
Context configuration [CONTEXT_CONF[44]]: 0x00
Context configuration [CONTEXT_CONF[43]]: 0x00
Context configuration [CONTEXT_CONF[42]]: 0x00
Context configuration [CONTEXT_CONF[41]]: 0x00
Context configuration [CONTEXT_CONF[40]]: 0x00
Context configuration [CONTEXT_CONF[39]]: 0x00
Context configuration [CONTEXT_CONF[38]]: 0x00
Context configuration [CONTEXT_CONF[37]]: 0x00
Packed command status [PACKED_COMMAND_STATUS]: 0x00
Packed command failure index [PACKED_FAILURE_INDEX]: 0x00
Power Off Notification [POWER_OFF_NOTIFICATION]: 0x01
Control to turn the Cache ON/OFF [CACHE_CTRL]: 0x01
eMMC Firmware Version: F9QN01K4
eMMC Life Time Estimation A [EXT_CSD_DEVICE_LIFE_TIME_EST_TYP_A]: 0x01
eMMC Life Time Estimation B [EXT_CSD_DEVICE_LIFE_TIME_EST_TYP_B]: 0x01
eMMC Pre EOL information [EXT_CSD_PRE_EOL_INFO]: 0x01
Command Queue Support [CMDQ_SUPPORT]: 0x01
Command Queue Depth [CMDQ_DEPTH]: 32
Command Enabled [CMDQ_MODE_EN]: 0x00

参考资料

JESD84-B51.pdf
man mmc
mmc source

Title:eMMC Boot Partition Size

Author:Victor Huang

Time:2019-08-11 / 14:08

Link:http://wowothink.com/7b44b327/

License: Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)