Linux: Partitioning eMMC from u-boot

Hi Yordan,

I have executed the commands and please check below, what is happening:

U-Boot# mmc dev 1
mmc_init: 0, time 299
switch to partitions #0, OK
mmc1(part 0) is current device

U-Boot# setenv uuid_gpt_disk ddc49fea-ca2a-430d-961a-b17caeadee63
Initial value for argc=3
Final value for argc=3

U-Boot# setenv uuid_gpt_rootfs 02527057-ebe1-4ec4-b321-4a35585d0770
Initial value for argc=3
Final value for argc=3

U-Boot# gpt write mmc 1 ${partitions}
Writing GPT: set_gpt_info: lba num: 0x734000 7553024
${uuid_gpt_disk} get from environment.
${uuid_gpt_rootfs} get from environment.
gpt_fill_pte: name: rootfs offset[0]: 0x1000 size[0]: 0x0
max lba: 734000
GPT successfully written to block device!
success!

U-Boot# mmc info
Device: OMAP SD/MMC
Manufacturer ID: fe
OEM: 14e
Name: MMC04
Tran Speed: 52000000
Rd Block Len: 512
MMC version 4.4.1
High Capacity: Yes
Capacity: 3.6 GiB
Bus Width: 4-bit
Erase Group Size: 512 KiB
HC WP Group Size: 4 MiB
User Capacity: 3.6 GiB
Boot Capacity: 16 MiB ENH
RPMB Capacity: 128 KiB ENH

U-Boot# mmc part
## Unknown partition table

U-Boot# mmc dev 1
mmc_init: 0, time 55
switch to partitions #0, OK
mmc1(part 0) is current device

Best Regards,
Ganesh

Hi Ganesh,

according to the wiki you need to restart the device after "gpt write mmc 1 ${partitions}" to make the partition table visible.

Regards,
Yordan

Hi Yordan,

Thank You. I am able to see partitions in MMC1 after restart ,

U-Boot# mmc part

Partition Map for MMC device 0 -- Partition Type: DOS

Part Start Sector Num Sectors UUID Type
1 63 144522 00000000-01 0c Boot
2 160650 7454160 00000000-02 83
U-Boot# mmc dev 1
mmc_init: 0, time 282
switch to partitions #0, OK
mmc1(part 0) is current device
U-Boot# mmc part

Partition Map for MMC device 1 -- Partition Type: EFI

GPT: first_usable_lba: 22 last_usable_lba: 733FDE last lba: 734000
alloc_read_gpt_entries: count = 128 * 128 = 16384
print_part_efi: gpt-entry at bef3dc40
Part Start LBA End LBA Name
Attributes
Type GUID
Partition GUID
1 0x00001000 0x00733fde "rootfs"
attrs: 0x0000000000000000
type: ebd0a0a2-b9e5-4433-87c0-68b6b72699c7
guid: 57705202-e1eb-c44e-b321-4a35585d0770
is_pte_valid: Found an unused PTE GUID at 0xBEF3DCC0

U-Boot# print partitions
partitions=uuid_disk=${uuid_gpt_disk};name=rootfs,start=2MiB,size=-,uuid=${uuid_gpt_rootfs}

1. When I issue mmcinfo commad from U-Boot I am only getting the SD card info, no information about eMMC
U-Boot# mmc info
Device: OMAP SD/MMC
Manufacturer ID: fe
OEM: 14e
Name: MMC04
Tran Speed: 52000000
Rd Block Len: 512
MMC version 4.4.1
High Capacity: Yes
Capacity: 3.6 GiB
Bus Width: 4-bit
Erase Group Size: 512 KiB
HC WP Group Size: 4 MiB
User Capacity: 3.6 GiB
Boot Capacity: 16 MiB ENH
RPMB Capacity: 128 KiB ENH

U-Boot# print partitions
partitions=uuid_disk=${uuid_gpt_disk};name=rootfs,start=2MiB,size=-,uuid=${uuid_gpt_rootfs}

2. Only one partition is created as in partitions only one is mentioned, I guess two partitions boot and rootfs is necessary to boot from eMMC. Or can I copy all the images to this partition and boot from eMMC???

Best regards,
Ganesh.

Hi Ganesh,

1. I am not sure why this happens, can you try to run "mmc rescan" before "mmc info"

2. I think two separate partitions are needed. Also according to this:
processors.wiki.ti.com/.../Linux_Core_U-Boot_User's_Guide
you may need to use raw writes to write MLO and u-boot.img on emmc.

Regards,
Yordan

Hi Yordan,

1. Tried "mmc rescan" befor "mmc info", but no change. No issue even if it is not displayed, until it's working
2. I have done raw writes using the below commands,
U-Boot # mmc dev 0
U-Boot # mmc rescan
U-Boot # mmc dev 1
U-Boot # fatload mmc 0 ${loadaddr} MLO
U-Boot # mmc write ${loadaddr} 0x100 0x100
U-Boot # mmc write ${loadaddr} 0x200 0x100
U-Boot # fatload mmc 0 ${loadaddr} u-boot.img
U-Boot # mmc write ${loadaddr} 0x300 0x400
and it is booting from eMMC till u-boot.

3. These two commands syntax is not clear:
U-Boot # fatload mmc 0 ${loadaddr} rootfs.ext4
U-Boot # mmc write ${loadaddr} 0x1000 ...rootfs.ext4 size in bytes divided by 512, in hex...
How should I copy the remaining images like zImage & dtb, file system and where??? I want to make eMMC as my booting device.

4. As we have not copied the remaining images into eMMC, I am getting the below error in u-boot:
HY status read failed
cpsw connected to Generic PHY
cpsw
initcall: 808046d9 (relocated to bff5d6d9)
Initial value for argc=3
Final value for argc=3
### main_loop entered: bootdelay=1

### main_loop: bootcmd="if test ${dofastboot} -eq 1; then echo Boot fastboot requested, resetting dofastboot ...;setenv dofastboot 0; saveenv;"
Hit any key to stop autoboot: 0
: returns 1
Command failed, result=1: returns 1
Command failed, result=1: returns 1
Command failed, result=1: returns 1
Command failed, result=1: returns 1
Command failed, result=1: returns 1
Command failed, result=1: returns 1
Command failed, result=1: returns 1
Command failed, result=1: returns 1
Command failed, result=1: returns 1
Command failed, result=1: returns 0
WARNING: Could not determine device tree to use
Card did not respond to voltage select!
mmc_init: -17, time 12
Command failed, result=1Card did not respond to voltage select!
mmc_init: -17, time 12
Command failed, result=1Command failed, result=1Card did not respond to voltage select!
mmc_init: -17, time 11
Command failed, result=1Card did not respond to voltage select!
mmc_init: -17, time 11
Command failed, result=1Command failed, result=1Initial value for argc=3
Final value for argc=3
Initial value for argc=3
Final value for argc=3
Initial value for argc=4
Final value for argc=4
mmc_init: 0, time 54
switch to partitions #0, OK
mmc1(part 0) is current device
mmc_init: 0, time 55
SD/MMC found on device 1
GPT: first_usable_lba: 22 last_usable_lba: 733FDE last lba: 734000
alloc_read_gpt_entries: count = 128 * 128 = 16384
is_pte_valid: Found an unused PTE GUID at 0xBEF4F2C0
get_partition_info_efi: *** ERROR: Invalid partition number 2 ***
** Invalid partition 2 **

Best Regards,
Ganesh

Hi Ganesh,

can you boot the board with the SD card? You can then use some of the scripts from this thread:

e2e.ti.com/.../488408

to format the emmc and copy necessary files from the Linux running on the board.

Regards,
Yordan