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问题已解决,管脚配置有误
/*
* Warning: to select Pin U16 for gpmc_a9.rmii2_crs_dv requires
* an additional register setting in the Control Module. See "sma2"
* register in TRM subsection "CONTROL_MODULE Registers" for more
* information. The recommended implementation is to write 0x1 to
* the register at the end of board_init() function in u-boot file:
* <source-dir>/board/ti/am335x/board.c
* int board_init(void) {
* ....
* u32 reg = readl(CTRL_BASE + 0x1320) | BIT(0);
* writel(reg, CTRL_BASE + 0x1320);
* ....
* }
*/