[U-Boot] Fixing dfu_alt_info field after DM conversion

[Fabio Estevam]

Hi Lukasz,

Myself and Joris have been working on DM conversion of pico-mx7 and
the the latest patches are available at:
https://github.com/jorisoffouga/u-boot/commits/pico-imx7d/convert-dm

Things are working well so far, except eMMC flashing via DFU.

The following error is seen we flash u-boot-dtb.img:

=> dfu 0 mmc 0
Request would exceed designated area!
#Deferred dfu_flush() failed!=>

Joris found a way to fix this problem by doing:

 #define CONFIG_DFU_ENV_SETTINGS \
         "dfu_alt_info=" \
                 "spl raw 0x2 0x400;" \
-                "u-boot raw 0x8a 0x400;" \
+                "u-boot raw 0x8a 0x1000;" \
                 "/boot/zImage ext4 0 1;" \
                 "/boot/imx7d-pico-hobbit.dtb ext4 0 1;" \
                 "/boot/imx7d-pico-pi.dtb ext4 0 1;" \

Is this an acceptable fix?

What does the last field in dfu_alt_info mean?

Thanks,

Fabio Estevam