1------------------------------------------------- 2 Simple steps used to test the QSPI at U-Boot 3------------------------------------------------- 4 5For #1, build the patched U-Boot and load MLO/u-boot.img 6 7---------------------------------- 8Boot from another medium like MMC 9---------------------------------- 10 11U-Boot# mmc dev 0 12mmc0 is current device 13U-Boot# fatload mmc 0 0x82000000 MLO 14reading MLO 1555872 bytes read in 8 ms (6.7 MiB/s) 16U-Boot# fatload mmc 0 0x83000000 u-boot.img 17reading u-boot.img 18248600 bytes read in 19 ms (12.5 MiB/s) 19 20-------------------------------------------------- 21Commands to erase/write u-boot/mlo to flash device 22-------------------------------------------------- 23U-Boot# sf probe 0 24SF: Detected S25FL256S_64K with page size 256 Bytes, erase size 64 KiB, total 32 MiB, mapped at 5c000000 25SF: Warning - Only lower 16MiB accessible, Full access #define CONFIG_SPI_FLASH_BAR 26U-Boot# sf erase 0 0x10000 27SF: 65536 bytes @ 0x0 Erased: OK 28U-Boot# sf erase 0x20000 0x10000 29SF: 65536 bytes @ 0x20000 Erased: OK 30U-Boot# sf erase 0x30000 0x10000 31SF: 65536 bytes @ 0x30000 Erased: OK 32U-Boot# sf erase 0x40000 0x10000 33SF: 65536 bytes @ 0x40000 Erased: OK 34U-Boot# sf erase 0x50000 0x10000 35SF: 65536 bytes @ 0x50000 Erased: OK 36U-Boot# sf erase 0x60000 0x10000 37SF: 65536 bytes @ 0x60000 Erased: OK 38U-Boot# sf write 82000000 0 0x10000 39SF: 65536 bytes @ 0x0 Written: OK 40U-Boot# sf write 83000000 0x20000 0x60000 41SF: 393216 bytes @ 0x20000 Written: OK 42 43For #2, set sysboot to QSPI-1 boot mode(SYSBOOT[5:0] = 100110) and power 44on. ROM should find the GP header at offset 0 and load/execute SPL. SPL 45then detects that ROM was in QSPI-1 mode (boot code 10) and attempts to 46find a U-Boot image header at offset 0x20000 (set in the config file) 47and proceeds to load that image using the U-Boot image payload offset/size 48from the header. It will then start U-Boot. 49