[U-Boot] erasing u-boot from u-boot

[Peng Fan]

On Mon, Jul 18, 2016 at 06:23:10PM +0000, Mike.Worster at Emerson.com wrote:
>I'm working with a 2015.04 version of U-Boot, I have it flashed on a i.MX6 DualLite based device in eMMC. I'm now trying to blow away that version of U-Boot from within U-Boot itself (so the device goes back into Serial Download mode).
>
>I've tried erasing the mmc0 (eMMC), the command works, but for some reason every time I power cycle the device U-Boot is still present. How do I delete it?

If you burned u-boot using mfgtool, the uboot will be burned into boot partition.
However when uboot boots up, it will switch to user partition.
You need to switch to read/write/erase boot partition in u-boot.

Regards,
Peng.

>
>=> mmc info
>Device: FSL_SDHC
>Manufacturer ID: 1e
>OEM: 1ff
>Name: TSEMM
>Tran Speed: 52000000
>Rd Block Len: 512
>MMC version 4.5
>High Capacity: Yes
>Capacity: 3.5 GiB
>Bus Width: 8-bit
>Erase Group Size: 512 KiB
>HC WP Group Size: 8 MiB
>User Capacity: 3.5 GiB ENH WRREL
>User Enhanced Start: 0 Bytes
>User Enhanced Size: 3.5 GiB
>Boot Capacity: 4 MiB ENH
>RPMB Capacity: 4 MiB ENH
>=>
>=> mmc dev
>switch to partitions #0, OK
>mmc0(part 0) is current device
>=>
>=> mmc erase 2 8
>
>MMC erase: dev # 0, block # 2, count 8 ...
>
>Caution! Your devices Erase group is 0x400
>The erase range would be change to 0x0~0x3ff
>
>8 blocks erased: OK
>
>
>Thanks.
>-Mike
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