Kernel加载时Waiting for root device /dev/mtdblock4

Reply to Kernel加载时Waiting for root device /dev/mtdblock4 on Sat, 03 May 2025 04:10:13 GMT

indream — Sat, 03 May 2025 04:10:13 GMT

刚好碰到这个问题，谢谢分享

Reply to Kernel加载时Waiting for root device /dev/mtdblock4 on Wed, 23 Apr 2025 15:29:19 GMT

zhanweixin — Wed, 23 Apr 2025 15:29:19 GMT

通过分析日志发现无法识别到型号为PY25Q256HB的NOR Flash

[    0.832587] sunxi_spif 44f00000.spif: unrecognized JEDEC id bytes: 85 20 19 85 20 19

解决办法如下：
1、打开${SDK_PATH}/bsp/drivers/mtd/spi-nor-5.4/spi-nor.c文件
搜索找到/* PUYA */位置，在后面添加

	{ "py25q256hb", INFO(0x852019, 0x0, 64 * 1024, 512, SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ | SPI_NOR_4B_OPCODES | USE_IO_MODE | USE_RX_DTR) },

2、打开${SDK_PATH}/device/config/chips/v821/configs/v2w/linux-5.4-ansc/board.dts文件
将&spif0里添加取消dtr_mode_enabled的注释

&spif0 {
	clock-frequency = <100000000>;
	pinctrl-0 = <&spif_pins_default &spif_pins_cs>;
	pinctrl-1 = <&spif_pins_sleep>;
	pinctrl-names = "default", "sleep";
	spif-rx-bus-width = <0x4>;
	spif-tx-bus-width = <0x4>;
	//prefetch_read_mode_enabled;	/* choose prefect read mode */
	dtr_mode_enabled;				/* choose double edge trigger mode */
	io_mode_enabled;				/* 1_x_x && x_x_x mode */
	status = "okay";

	spif-nor  {
		device_type = "spi_board0";
		compatible = "spif-nor";
		spi-max-frequency = <0x5f5e100>;
		reg = <0x0>;
		status = "disabled";
	};
};

此问题顺利解决

Reply to Kernel加载时Waiting for root device /dev/mtdblock4 on Wed, 23 Apr 2025 02:49:19 GMT

zhanweixin — Wed, 23 Apr 2025 02:49:19 GMT

补充下u-boot的env配置信息如下

=> env print
arm-smmu-v3=0
boot_fastboot=fastboot
boot_normal=sunxi_flash read 82000000 ${boot_partition};bootm 82000000
boot_partition=boot
boot_recovery=sunxi_flash read 82000000 recovery;bootm 82000000
boot_riscv=bootrv 82000000 200000 0 riscv0 riscv0-r
bootcmd=run setargs_nor boot_normal
bootdelay=3
cma=1M
console=ttyS0,115200
earlyprintk=sunxi-uart,0x42500000
fastboot_key_value_max=0x8
fastboot_key_value_min=0x2
fdtcontroladdr=8394bea4
force_normal_boot=1
init=/init
initcall_debug=0
loglevel=8
mmc_root=/dev/mmcblk0p5
mtdids=▒Bs▒0▒
mtdparts=▒Bs▒0▒
nor_root=/dev/mtdblock4
partition=▒Bs▒0▒
partitions=env@mtdblock1:boot@mtdblock2:riscv0@mtdblock3:rootfs@mtdblock4:rootfs_data@mtdblock5:UDISK@mtdblock6
rdinit=/rdinit
recovery_key_value_max=0x13
recovery_key_value_min=0x10
riscv_partition=riscv0
root_partition=rootfs
rotpk_status=0
selinux=0
setargs_mmc=setenv bootargs earlyprintk=${earlyprintk} initcall_debug=${initcall_debug} console=${console} loglevel=${loglevel} root=${mmc_root} rootwait init=${init} rdinit=${rdinit} partitions=${partitions} cma=${cma} snum=${snum} mac_addr=${mac} wifi_mac=${wifi_mac} bt_mac=${bt_mac} selinux=${selinux} specialstr=${specialstr} gpt=1 arm-smmu-v3.disable_bypass=${arm-smmu-v3}
setargs_nand=setenv bootargs earlyprintk=${earlyprintk} initcall_debug=${initcall_debug} console=${console} loglevel=${loglevel} root=${nand_root} rootwait init=${init} rdinit=${rdinit} partitions=${partitions} cma=${cma} snum=${snum} mac_addr=${mac} wifi_mac=${wifi_mac} bt_mac=${bt_mac} selinux=${selinux} specialstr=${specialstr} gpt=1 arm-smmu-v3.disable_bypass=${arm-smmu-v3}
setargs_nor=setenv bootargs earlyprintk=${earlyprintk} initcall_debug=${initcall_debug} console=${console} loglevel=${loglevel} root=${nor_root} rootwait init=${init} rdinit=${rdinit} partitions=${partitions} cma=${cma} coherent_pool=${coherent_pool}
snum=7c000c70f6c107d1fcf
wifi_mac=60:c2:2a:10:1b:47

Environment size: 1978/65532 bytes