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Simple steps used to test the SH-QSPI at U-Boot
-------------------------------------------------
#0, Currently, SH-QSPI is used by lager board (Renesas ARM SoC R8A7790)
and koelsch board (Renesas ARM SoC R8A7791). These boot from SPI ROM
basically. Thus, U-Boot start, SH-QSPI will is operating normally.
#1, build U-Boot and load u-boot.bin
=> tftpboot 40000000 u-boot.bin
sh_eth Waiting for PHY auto negotiation to complete.. done
sh_eth: 100Base/Half
Using sh_eth device
TFTP from server 192.168.169.1; our IP address is 192.168.169.79
Filename 'u-boot.bin'.
Load address: 0x40000000
Loading: ############
2.5 MiB/s
done
Bytes transferred = 175364 (2ad04 hex)
#2, Commands to erase/write u-boot to flash device
Note: This method is description of the lager board. If you want to use the
other boards, please change the value according to each environment.
=> sf probe 0
SF: Detected S25FL512S_256K with page size 512 Bytes, erase size 64 KiB, total 64 MiB
=> sf erase 80000 40000
SF: 262144 bytes @ 0x80000 Erased: OK
=> sf write 40000000 80000 175364
SF: 1528676 bytes @ 0x80000 Written: OK
=>
#3, Push reset button.
If you're written correctly and driver works properly, U-Boot starts.