How to change DOS partition Table to GPT partitions for eMMC device.

[vishalg]

Dear Community members ,

I am using S32G3-RDB3 Hardware. 
Can someone please tell how to create GPT partitions for my eMMC device and where shall i change in my Yocto build for S32G3-RDB3 hardware.
Currently the issue is, that it cerates  DOS partition Table, which the eMMC device drivers is not able to recognize(eMMC device drivers only recognizes GPT partitions Table).

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Hardware logs
----------------------------------------------------------------------------------------root@s32g3:~# fdisk -l /dev/mmcblk0

Disk /dev/mmcblk0: 232.97 GiB, 250148290560 bytes, 488570880 sectors

Units: sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disklabel type: dos

Disk identifier: 0xef5a771f

Device         Boot   Start       End   Sectors   Size Id Type

/dev/mmcblk0p1 *       2048     63931     61884  30.2M  c W95 FAT32 (LBA)

/dev/mmcblk0p2        65536   3211263   3145728   1.5G 83 Linux

/dev/mmcblk0p3      3211264   3416063    204800   100M 83 Linux

/dev/mmcblk0p4      3416064 488570879 485154816 231.3G 83 Linux

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And i want the existing data to be as it is, as it was for DOS partition table , is should be same for GPT partition.
Note:(I tried doing it during the runtime , using fdisk on the hardware it self , but i am loosing all partition table data and configuration). 

Regards,

Vishal G

[chenyin_h]

Hello, @vishalg 

Thanks for your post.

GPT is usually used for the situation that with very large size or more partitions needed, not sure why your eMMC drivers could not access the MBR partition table.

I have tested on the RDB3 with BSP42. Currently, from BSP perspective,  for example, the uboot load kernel image from the corresponding partition with fatload command, which seems only recognize the MBR format. I ever tested the SD card with GPT, the loading operation would fail.

From my experience, it is possible to add GPT support on u-boot, but it is not included in the formal BSP release, there would be several settings/some codes need to be modified in order to load images correctly with GPT support.

BR

Chenyin