u-boot without flash device

Solved.

define config_sys_no_flash

do not define config_flash_cfi_driver

do not define config_cmd_flash (undefine it if necessary

do not define config_cmd_imls (undefine it if necessary)

You may still see error in compilation.

Go to u-boot/lib_nios2/board.c

around line 155, comment out the line

//bd->bi_flashsize = flash_init();

At least, this will give you a command prompt of the u-boot.

Or simply the board.c file should use# ifdef to process this line.

1 more thing. If you are using the config_cmd_default, then...

In side of u-boot/include/config_cmd_default.h

around line 25, comment out# define CONFIG_CMD_FLASH