微處理器 - Nuvoton NUC977 - Flash SPI

1. 設定PA0、PA1成USB啟動
2. 開啟CONFIG_ENV_IS_IN_SPI_FLASH並編譯UBoot程式

$ vim include/configs/nuc970_evb.h
    48 #define CONFIG_SYS_USE_SPIFLASH
    49 #define CONFIG_SYS_USE_NANDFLASH
    50 #define CONFIG_SYS_NO_FLASH    // that is, no *NOR* flash
    51 //#define CONFIG_ENV_IS_IN_NAND
    52 #define CONFIG_ENV_IS_IN_SPI_FLASH
    53 //#define CONFIG_ENV_IS_IN_MMC

3. 編輯env.txt

$ vim spi_env.txt
    bootcmd=sf probe 0 18000000; sf read 0x7fc0 0x200000 0x1bc3d8; bootm 0x7fc0
    baudrate=115200
    bootdelay=3
    ethact=emac
    ethaddr=00:00:00:11:66:88
    stderr=serial
    stdin=serial
    stdout=serial

4. 燒錄至SPI

$ sudo nuwriter -m spi -d NUC977DK62Y.ini -e 0xffffffff
$ sudo nuwriter -m spi -d NUC977DK62Y.ini -t env -a 0x80000 -w spi_env.txt -v
$ sudo nuwriter -m spi -d NUC977DK62Y.ini -t uboot -a 0xE00000 -w u-boot.bin -v
$ sudo nuwriter -m spi -d NUC977DK62Y.ini -t data -a 0x200000 -w arch/arm/boot/uImage -v