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   Simple steps used to test the QSPI at U-Boot 
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For #1, build the patched U-Boot and load MLO/u-boot.img

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Boot from another medium like MMC
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DRA752 EVM # mmc dev 0
DRA752 EVM # fatload mmc 0 0x82000000 MLO
DRA752 EVM # fatload mmc 0 0x82000000 u-boot.img

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Commands to erase/write u-boot/mlo to flash device
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DRA752 EVM # sf probe 0
[should detect the S25FL256S serial flash device]

DRA752 EVM # sf erase 0 10000
DRA752 EVM # sf erase 10000 10000
DRA752 EVM # sf erase 20000 10000
DRA752 EVM # sf erase 30000 10000
DRA752 EVM # sf erase 40000 10000
DRA752 EVM # sf erase 50000 10000
DRA752 EVM # sf erase 60000 10000

DRA752 EVM # sf write 82000000 0 10000
DRA752 EVM # sf write 83000000 20000 60000

For #2, set sysboot to QSPI-1 boot mode(SYSBOOT[5:0] = 100110) and power
on. ROM should find the GP header at offset 0 and load/execute SPL. SPL
then detects that ROM was in QSPI-1 mode (boot code 10) and attempts to
find a U-Boot image header at offset 0x20000 (set in the config file)
and proceeds to load that image using the U-Boot image payload offset/size
from the header. It will then start U-Boot.
~