@awwwwa 有具体的源码可以看一下吗？
我手上有一份 Allwinner V3s SPI NOR Flash Support List_20150509 V1.0.pdf 这里面所有的 nor flash 都是小于等于128Mbit 的，是不是说 V3s 的 BROM 代码里没有复位 spi nor flash 寄存器的过程？

如果 brom 已经无法动了，有没有办法绕过这个问题呢？比如 V3s 是否有哪些固定的引脚在复位（reset复位或者watchdog复位）过程中会被拉低呢？也许把这个脚接到 nor flash 的 #RESET 脚？

@awwwwa 在 V3s nor flash 烧录之后必须断电才能引导？ 中说：

rtc的fel标识位置

并没有。

根据手册打印了RTC所有的寄存器。

$ sunxi-fel hex 0x01c20400 288
01c20400: 00 40 00 00 04 00 00 00 14 00 00 00 00 00 00 00  .@..............
01c20410: 01 01 00 00 25 12 00 00 00 00 00 00 00 00 00 00  ....%...........
01c20420: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
01c20430: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
01c20440: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
01c20450: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
01c20460: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
01c20470: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
01c20480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
01c20490: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
01c204a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
01c204b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
01c204c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
01c204d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
01c204e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
01c204f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
01c20500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
01c20510: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................

会不会是我贴的 W25Q256 不支持呢？这个NOR是32MiB的，会被uboot设置进入4字节模式？

即便断电再上电进入 u-boot 之后，拉低 RESET 还是不能正常重启，会进入 fel，是布线的问题吗？还是说需要让 Winbond Flash 正确 reset？

将 u-boot-sunxi-with-spl.bin 通过 sunxi-fel spiflash-write 0 u-boot-sunxi-with-spl.bin 命令烧录到 nor flash 的头部之后，短接 #RESET 和地之后仍然会进入 fel 模式，必须彻底断电再上电才能进入 u-boot 引导。是哪里出了问题呢？
SPI 四线已经通过 10K 电阻拉高了