Hi,
I’m facing an issue where the BeaglePlay eMMC (mmcblk0) is not detected at all—only mmcblk1 (SD card) appears in the system. When using the eMMC flasher image, flashing fails with:
destination /dev/mmcblk0 doesnot exist and the system ends in a kernel panic.
Booting from SD works, but still the eMMC device never shows up.
Looking for help on why mmc0 is missing and how to debug this further.
Please share the output of sudo beagle-version
Regards,
My only beagle with flash is a A5C BBB. On that “lsblk” gives:
[summers@BBB ~]$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
mmcblk0 179:0 0 29.8G 0 disk /home
mmcblk1 179:256 0 1.8G 0 disk
`-mmcblk1p1 179:257 0 1.8G 0 part /
mmcblk1boot0 179:512 0 1M 1 disk
mmcblk1boot1 179:768 0 1M 1 disk
In my case mmcblk1 is emmc and the “mmc” util from mmc-utils use use something like:
sudo mmc extcsd read /dev/mmcblk1
For my eMMC that gives
[summers@BBB ~]$ sudo mmc extcsd read /dev/mmcblk1
=============================================
Extended CSD rev 1.5 (MMC 4.41)
=============================================
Card Supported Command sets [S_CMD_SET: 0x01]
HPI Features [HPI_FEATURE: 0x03]: implementation based on CMD12
Background operations support [BKOPS_SUPPORT: 0x01]
Background operations status [BKOPS_STATUS: 0x02]
1st Initialisation Time after programmed sector [INI_TIMEOUT_AP: 0x7a]
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]
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: 0x06]
Secure Feature support [SEC_FEATURE_SUPPORT: 0x15]
Secure Erase Multiplier [SEC_ERASE_MULT: 0x02]
Secure TRIM Multiplier [SEC_TRIM_MULT: 0x03]
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: 0x08]
Access size [ACC_SIZE: 0x05]
High-capacity erase unit size [HC_ERASE_GRP_SIZE: 0x00]
i.e. 0 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: 0x00]
i.e. 0 KiB
Sleep current (VCC) [S_C_VCC: 0x08]
Sleep current (VCCQ) [S_C_VCCQ: 0x08]
Sleep/awake timeout [S_A_TIMEOUT: 0x10]
Sector Count [SEC_COUNT: 0x00000000]
Device is NOT block-addressed
Minimum Write Performance for 8bit:
[MIN_PERF_W_8_52: 0x08]
[MIN_PERF_R_8_52: 0x08]
[MIN_PERF_W_8_26_4_52: 0x08]
[MIN_PERF_R_8_26_4_52: 0x08]
Minimum Write Performance for 4bit:
[MIN_PERF_W_4_26: 0x08]
[MIN_PERF_R_4_26: 0x08]
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: 0x02]
Card Type [CARD_TYPE: 0x07]
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: 0x01]
Erased memory content [ERASED_MEM_CONT: 0x00]
Boot configuration bytes [PARTITION_CONFIG: 0x00]
Not boot enable
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: 0x00]
Boot write protection status registers [BOOT_WP_STATUS]: 0x00
Boot Area Write protection [BOOT_WP]: 0x00
Power ro locking: possible
Permanent ro locking: possible
partition 0 ro lock status: not locked
partition 1 ro lock status: not locked
User area write protection register [USER_WP]: 0x00
FW configuration [FW_CONFIG]: 0x00
RPMB Size [RPMB_SIZE_MULT]: 0x01
Write reliability setting register [WR_REL_SET]: 0x00
user area: existing data is at risk if a power failure occurs during a write operation
partition 1: existing data is at risk if a power failure occurs during a write operation
partition 2: existing data is at risk if a power failure occurs during a write operation
partition 3: existing data is at risk if a power failure occurs during a write operation
partition 4: existing data is at risk if a power failure occurs during a write operation
Write reliability parameter register [WR_REL_PARAM]: 0x05
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]: 0x03
Device support partitioning feature
Device can have enhanced tech.
Max Enhanced Area Size [MAX_ENH_SIZE_MULT]: 0x0001ca
i.e. 0 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
And this is useful
[summers@BBB mmc1:0001]$ cat /sys/class/mmc_host/*/mmc*/name
EB1QT
MMC02G
And you can seem my eMMC has the name MMC02G - so its one of the old 2G devices