I have downloaded the latest u-boot by means of CVS,and i configured it for MX1ADS,but I dont konw the code in board/mx1ads/flash.c int flash_erase(flash_info_t * info, int first ,int last) { ..................... icache_disable(); .................... } before the actual operation for the syncflash,why disable the I cache! I have dealed with Flash for some time ,but I never meet thing like such!