IMX6ULL EMMC BOOT

[carlosfernandez]

Hi all,

I'm using the UTP communicatin interface in the mfg_tools in order flash my imx6ullevk based custom board. EMMC is flashed ok and zImage, device tree and root file system are written OK in the EMMC but u-boot is not booting at startup.

1. The EMMC is set on usdhc2 position
2. The boot configuration seems to bee OK in order to boot from EMMC-1
3. The commands using for flashing the u-boot are the same that used in mfg_tools ucl2.xml. And I'm using the u-boot-imx6ull14x14evk_emmc.imx file in mfg_tools L4.9.11_1.0.0-ga_mfg-tools. These are the executed commands:

<CMD state="Updater" type="push" body="send" file="mksdcard.sh.tar">Sending partition shell</CMD>
<CMD state="Updater" type="push" body="$ tar xf $FILE "> Partitioning...</CMD>
<CMD state="Updater" type="push" body="$ sh mksdcard.sh /dev/mmcblk%mmc%"> Partitioning...</CMD>

<!-- burn uboot -->
<CMD state="Updater" type="push" body="$ dd if=/dev/zero of=/dev/mmcblk%mmc% bs=1k seek=768 conv=fsync count=136">clear u-boot arg</CMD>
<!-- access boot partition -->
<CMD state="Updater" type="push" body="$ echo 0 > /sys/block/mmcblk%mmc%boot0/force_ro">access boot partition 1</CMD>
<CMD state="Updater" type="push" body="send" file="files/u-boot-imx6ull%6uluboot%_emmc.imx" ifdev="MX6ULL">Sending u-boot.bin</CMD>
<CMD state="Updater" type="push" body="$ dd if=$FILE of=/dev/mmcblk%mmc%boot0 bs=512 seek=2">write U-Boot to sd card</CMD>
<CMD state="Updater" type="push" body="$ echo 1 > /sys/block/mmcblk%mmc%boot0/force_ro"> re-enable read-only access </CMD>
<CMD state="Updater" type="push" body="$ mmc bootpart enable 1 1 /dev/mmcblk%mmc%">enable boot partion 1 to boot</CMD>

But after flashing and setting the boot switches OK, nothing appears on my serial terminal. If I boot from SD, everything goes OK and I can manage to boot zImage and rootfs in EMMC, but u-boot is never booting from EMMC.

What could be wrong?

Thanks in advance

[igorpadykov]

Hi Carlos

if emmc is intended to boot in 8-bit bus width mode, as suggested in

imx6ullevk schematic, emmc Extend CSD register byte[177] bits[0:1] should

be progarmmed accordingly. As stated in mmc 4.4.1 specification  JESD84-A441

During boot operation, bus width can be configured by non-volatile configuration
bits in the Extend CSD register byte[177] bit[0:1].

Further debug steps could be checking emmc signals with oscilloscope and

check with jtag registers SRC_SBMR1,2 for proper boot settings.

Best regards
igor
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[carlosfernandez]

Hi Igor, 

Thanks for your help. So, let me understand this, should I add some kind of UTP message using the "mmc" tool in order to write onto the EMMC registers? 

[igorpadykov]

Hi Carlos

mfg tool is small linux image and executes linux commands (examples can be

found in ucl2.xml), so one can add any necessary commands to ucl2.xml if needed.

Best regards
igor

[carlosfernandez]

Hi Igor,

The command "mmc bootpart enable 1 1 /dev/mmcblk1"  should do. But is not changing the last bit of the PARTITION_CONFIG register (should be 0x49 but it's left at 0x48). I don't know if its a type of bug or some further register must be configuret before changint the PARTITION_CONFIG.

[parthitce]

Hi,

Although this is old thread, I want to add my finding to the last discussed point here. I came across the same problem. PARTITION_CONFIG bit 0 - 2 is to specify the partition to use for finding the boot image. Here you may need to use "mmcblk1boot0 or boot1" accordingly for setting this bit. So `mmc bootpart enable 1 1 /dev/mmcblk1boot0` is the correct way to enable it.

[carlosfernandez]

After executing these utp commands: 

./utp_com -d /dev/sg2 -c "$ dd if=/dev/zero of=/dev/mmcblk1 bs=1k seek=768 conv=fsync count=136"

./utp_com -d /dev/sg2 -c "$ echo 0 > /sys/block/mmcblk1boot0/force_ro"

./utp_com -d /dev/sg2 -c "send" -f u-boot-imx6ull14x14evk_emmc.imx

./utp_com -d /dev/sg2 -c "$ dd if=\$FILE of=/dev/mmcblk1boot0 bs=512 seek=2"

 ./utp_com -d /dev/sg2 -c "$ echo 1 > /sys/block/mmcblk1boot0/force_ro"

 ./utp_com -d /dev/sg2 -c "$ mmc bootpart enable 1 1 /dev/mmcblk1"

  ./utp_com -d /dev/sg2 -c "$ mmc extcsd read /dev/mmcblk1"

I have this extcsd info in my EMMC: 

=============================================
Extended CSD rev 1.7 (MMC 5.0)
=============================================

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: 0x3f]
Max Packet Write Cmd [MAX_PACKED_WRITES: 0x3f]
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: 0x7f]
Large Unit Size [LARGE_UNIT_SIZE_M1: 0x00]
Extended partition attribute support [EXT_SUPPORT: 0x03]
Generic CMD6 Timer [GENERIC_CMD6_TIME: 0x05]
Power off notification [POWER_OFF_LONG_TIME: 0x32]
Cache Size [CACHE_SIZE] is 4096 KiB
Background operations status [BKOPS_STATUS: 0x00]
1st Initialisation Time after programmed sector [INI_TIMEOUT_AP: 0x1e]
Power class for 52MHz, DDR at 3.6V [PWR_CL_DDR_52_360: 0x22]
Power class for 52MHz, DDR at 1.95V [PWR_CL_DDR_52_195: 0x77]
Power class for 200MHz at 3.6V [PWR_CL_200_360: 0x88]
Power class for 200MHz, at 1.95V [PWR_CL_200_195: 0x88]
Minimum Performance for 8bit at 52MHz in DDR mode:
[MIN_PERF_DDR_W_8_52: 0x00]
[MIN_PERF_DDR_R_8_52: 0x50]
TRIM Multiplier [TRIM_MULT: 0x01]
Secure Feature support [SEC_FEATURE_SUPPORT: 0x55]
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: 0x10]
Access size [ACC_SIZE: 0x08]
High-capacity erase unit size [HC_ERASE_GRP_SIZE: 0x08]
i.e. 4096 KiB
High-capacity erase timeout [ERASE_TIMEOUT_MULT: 0x07]
Reliable write sector count [REL_WR_SEC_C: 0x01]
High-capacity W protect group size [HC_WP_GRP_SIZE: 0x01]
i.e. 4096 KiB
Sleep current (VCC) [S_C_VCC: 0x06]
Sleep current (VCCQ) [S_C_VCCQ: 0x0a]
Sleep/awake timeout [S_A_TIMEOUT: 0x10]
Sector Count [SEC_COUNT: 0x00760000]
Device is block-addressed
Minimum Write Performance for 8bit:
[MIN_PERF_W_8_52: 0x00]
[MIN_PERF_R_8_52: 0x64]
[MIN_PERF_W_8_26_4_52: 0x00]
[MIN_PERF_R_8_26_4_52: 0x3c]
Minimum Write Performance for 4bit:
[MIN_PERF_W_4_26: 0x00]
[MIN_PERF_R_4_26: 0x1e]
Power classes registers:
[PWR_CL_26_360: 0x22]
[PWR_CL_52_360: 0x22]
[PWR_CL_26_195: 0x66]
[PWR_CL_52_195: 0x66]
Partition switching timing [PARTITION_SWITCH_TIME: 0x01]
Out-of-interrupt busy timing [OUT_OF_INTERRUPT_TIME: 0x0a]
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: 0x02]
High-speed interface timing [HS_TIMING: 0x01]
Erased memory content [ERASED_MEM_CONT: 0x00]
Boot configuration bytes [PARTITION_CONFIG: 0x48]
Boot Partition 1 enabled
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
ro lock status: not locked
User area write protection register [USER_WP]: 0x00
FW configuration [FW_CONFIG]: 0x00
RPMB Size [RPMB_SIZE_MULT]: 0x04
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]: 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]: 0x07
Device support partitioning feature
Device can have enhanced tech.
Max Enhanced Area Size [MAX_ENH_SIZE_MULT]: 0x0001d8
i.e. 1933312 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]: 0x000000
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]]: 0x00
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]]: 0x00
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]]: 0x00
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]: 0x01
Sector size emulation [USE_NATIVE_SECTOR]: 0x00
Sector size [DATA_SECTOR_SIZE]: 0x00
1st initialization after disabling sector size emulation [INI_TIMEOUT_EMU]: 0x0a
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

But it's still not booting from EMMC even if I put the correct boot switches.

It seems that the problem comes from here. PARTITION_CONFIG should be 0x49 in order to grant acces to the boot partition. But I cannot change this value with "mmc bootpart command"

Boot configuration bytes [PARTITION_CONFIG: 0x48]
Boot Partition 1 enabled
No access to boot partition