图1、2 在原理图和芯片手册中观察到SDMMC可以复用为UART，在设备树中已经把设备树中SDMMC代码注释掉。
图3在设备树中添加UART1串口，引脚配置为pinctrl-0 =<&uart5m0 xfer>;
重新编译内核并烧写boot，使用串口调试助手连接SDMMC上的两个引脚接收不到信息。
图4 uart5按照pinctrl-0 = <&uart5m1 xfer>配置可以成功复用为UART
如何复用Luckfox Pico Mini B 中的SDMMC 接口为 UART串口？
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额图是倒着的，没有按照上传顺序来
您好，如果您需要将gpio3_a7 gpio3_a6 复用为 uart5m0，请将sdmmc 的 status 修改为 disabled，然后添加
在uart1 中添加uart5m0_xfer是无法生效的
Code: Select all
&uart5 {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&uart5m0_xfer>;
}
问题是我的uart5已经复用为了<&uart5m1_xfer>，还有其它办法吗？ 
意思是我一共要使用4个UART，除了能够显式配置的UART3、UART4、UART5外，还有调试串口UART2外，还有剩余UARTA吗，我看芯片手册中支持UART0-UART5.
一个UART控制器同一时间只能控制一组引脚，不同UART控制器连接的引脚是不一样的，所以在UART1中不能把pinctrl设置成没有连接的UART5M1引脚, RV1103虽然有6组UART 但是UART0和UART1的引脚没有从芯片引出，要用四组UART只能考虑使用GPIO模拟了
那看来只能把UART2改为普通串口了，我看论坛里都是把UART2调试串口改为另一个串口，完全去除调试串口的功能是可行的吗？
Edit `sysdrv/source/uboot/u-boot/arch/arm/dts/rv1106-u-boot.dtsi`
Code: Select all
chosen {
stdout-path = &uart2;
u-boot,spl-boot-order = &sdmmc, &spi_nand, &emmc;
};
单纯禁用的话直接把uart2改成uart1就可以了吗
Code: Select all
chosen {
stdout-path = &uart2;
u-boot,spl-boot-order = &sdmmc, &spi_nand, &emmc;
};
单纯禁用的话直接把uart2改成uart1就可以了吗
viewtopic.php?t=975
按照论坛的方式把调试uart2改成uart1，在 重启内核前依旧会发送调试信息：
DDR 306b9977f5 wesley.yao 23/12/21-09:28:37,fwver: v1.15
S5P1
4x
fc27
F
DDRConf1
DDR2, BW=16 Col=10 Bk=4 CS0 Row=13 CS=1 Size=64MB
528MHz
DDR bin out
U-Boot SPL board init
U-Boot SPL 2017.09 (Jun 05 2025 - 16:43:17)
Trying to boot from MMC2
MMC: no card present
mmc_init: -123, time 2
spl: mmc init failed with error: -123
Trying to boot from MTD1
ENVF: Primary 0x00000000 - 0x00040000
No misc partition
Trying fit image at 0x400 sector
## Verified-boot: 0
## Checking uboot 0x00200000 (lzma @0x00400000) ... sha256(93ff36cc36...) + sha256(baec9426ad...) + OK
## Checking fdt 0x00260998 ... sha256(9f596c5683...) + OK
Total: 122.118/201.423 ms
Jumping to U-Boot(0x00200000)
U-Boot 2017.09 (Jun 05 2025 - 16:43:17 +0800)
Model: Rockchip RV1106 EVB Board
MPIDR: 0xf00
PreSerial: 2, raw, 0xff4c0000
DRAM: 64 MiB
Sysmem: init
Relocation Offset: 03d81000
Relocation fdt: 02dfa778 - 02dfede0
CR: M/C/I
Using default environment
Bootdev(atags): mtd 1
ENVF: Primary 0x00000000 - 0x00040000
PartType: ENV
DM: v2
No misc partition
boot mode: normal
RESC: 'boot', blk@0x00001f89
resource: sha256+
FIT: no signed, no conf required
DTB: rk-kernel.dtb
HASH(c): OK
Model: Luckfox Pico Mini
## retrieving sd_update.txt ...
MMC: no card present
mmc_init: -123, time 2
CLK: (uboot. arm: enter 816000 KHz, init 816000 KHz, kernel 0N/A)
apll 816000 KHz
dpll 528000 KHz
gpll 1188000 KHz
cpll 1000000 KHz
aclk_peri_root 400000 KHz
hclK_peri_root 200000 KHz
pclk_peri_root 100000 KHz
aclk_bus_root 300000 KHz
pclk_top_root 100000 KHz
pclk_pmu_root 100000 KHz
hclk_pmu_root 200000 KHz
Net: eth0: ethernet@ffa80000
Hit key to stop autoboot('CTRL+C'): 0
## Booting FIT Image at 0x2908540 with size 0x002f1200
Fdt Ramdisk skip relocation
No misc partition
## Loading kernel from FIT Image at 02908540 ...
Using 'conf' configuration
## Verified-boot: 0
Trying 'kernel' kernel subimage
Description: unavailable
Type: Kernel Image
Compression: uncompressed
Data Start: 0x02911b40
Data Size: 3046400 Bytes = 2.9 MiB
Architecture: ARM
OS: Linux
Load Address: 0x00008000
Entry Point: 0x00008000
Hash algo: sha256
Hash value: 67556d13d2f2672009ef36212f154747d9e33fddd119a64e7a8b7d2903fc4489
Verifying Hash Integrity ... sha256+ OK
## Loading fdt from FIT Image at 02908540 ...
Using 'conf' configuration
Trying 'fdt' fdt subimage
Description: unavailable
Type: Flat Device Tree
Compression: uncompressed
Data Start: 0x02908d40
Data Size: 35874 Bytes = 35 KiB
Architecture: ARM
Load Address: 0x00c00000
Hash algo: sha256
Hash value: fb7229121556743b1b43bbc20d6411720da760e4f383d68cc4ca9326d0abc00d
Verifying Hash Integrity ... sha256+ OK
Loading fdt from 0x02908540 to 0x00c00000
Booting using the fdt blob at 0x00c00000
Loading Kernel Image from 0x02911b40 to 0x00008000 ... OK
kernel loaded at 0x00008000, end = 0x002efc00
Using Device Tree in place at 00c00000, end 00c0bc21
Adding bank: 0x00000000 - 0x04000000 (size: 0x04000000)
Total: 552.203/758.717 ms
Starting kernel ...
怎么做才能把uart2改成数据串口？在其它的串口也不进行改动的情况下，因为我并不需要调试串口
按照论坛的方式把调试uart2改成uart1，在 重启内核前依旧会发送调试信息：
DDR 306b9977f5 wesley.yao 23/12/21-09:28:37,fwver: v1.15
S5P1
4x
fc27
F
DDRConf1
DDR2, BW=16 Col=10 Bk=4 CS0 Row=13 CS=1 Size=64MB
528MHz
DDR bin out
U-Boot SPL board init
U-Boot SPL 2017.09 (Jun 05 2025 - 16:43:17)
Trying to boot from MMC2
MMC: no card present
mmc_init: -123, time 2
spl: mmc init failed with error: -123
Trying to boot from MTD1
ENVF: Primary 0x00000000 - 0x00040000
No misc partition
Trying fit image at 0x400 sector
## Verified-boot: 0
## Checking uboot 0x00200000 (lzma @0x00400000) ... sha256(93ff36cc36...) + sha256(baec9426ad...) + OK
## Checking fdt 0x00260998 ... sha256(9f596c5683...) + OK
Total: 122.118/201.423 ms
Jumping to U-Boot(0x00200000)
U-Boot 2017.09 (Jun 05 2025 - 16:43:17 +0800)
Model: Rockchip RV1106 EVB Board
MPIDR: 0xf00
PreSerial: 2, raw, 0xff4c0000
DRAM: 64 MiB
Sysmem: init
Relocation Offset: 03d81000
Relocation fdt: 02dfa778 - 02dfede0
CR: M/C/I
Using default environment
Bootdev(atags): mtd 1
ENVF: Primary 0x00000000 - 0x00040000
PartType: ENV
DM: v2
No misc partition
boot mode: normal
RESC: 'boot', blk@0x00001f89
resource: sha256+
FIT: no signed, no conf required
DTB: rk-kernel.dtb
HASH(c): OK
Model: Luckfox Pico Mini
## retrieving sd_update.txt ...
MMC: no card present
mmc_init: -123, time 2
CLK: (uboot. arm: enter 816000 KHz, init 816000 KHz, kernel 0N/A)
apll 816000 KHz
dpll 528000 KHz
gpll 1188000 KHz
cpll 1000000 KHz
aclk_peri_root 400000 KHz
hclK_peri_root 200000 KHz
pclk_peri_root 100000 KHz
aclk_bus_root 300000 KHz
pclk_top_root 100000 KHz
pclk_pmu_root 100000 KHz
hclk_pmu_root 200000 KHz
Net: eth0: ethernet@ffa80000
Hit key to stop autoboot('CTRL+C'): 0
## Booting FIT Image at 0x2908540 with size 0x002f1200
Fdt Ramdisk skip relocation
No misc partition
## Loading kernel from FIT Image at 02908540 ...
Using 'conf' configuration
## Verified-boot: 0
Trying 'kernel' kernel subimage
Description: unavailable
Type: Kernel Image
Compression: uncompressed
Data Start: 0x02911b40
Data Size: 3046400 Bytes = 2.9 MiB
Architecture: ARM
OS: Linux
Load Address: 0x00008000
Entry Point: 0x00008000
Hash algo: sha256
Hash value: 67556d13d2f2672009ef36212f154747d9e33fddd119a64e7a8b7d2903fc4489
Verifying Hash Integrity ... sha256+ OK
## Loading fdt from FIT Image at 02908540 ...
Using 'conf' configuration
Trying 'fdt' fdt subimage
Description: unavailable
Type: Flat Device Tree
Compression: uncompressed
Data Start: 0x02908d40
Data Size: 35874 Bytes = 35 KiB
Architecture: ARM
Load Address: 0x00c00000
Hash algo: sha256
Hash value: fb7229121556743b1b43bbc20d6411720da760e4f383d68cc4ca9326d0abc00d
Verifying Hash Integrity ... sha256+ OK
Loading fdt from 0x02908540 to 0x00c00000
Booting using the fdt blob at 0x00c00000
Loading Kernel Image from 0x02911b40 to 0x00008000 ... OK
kernel loaded at 0x00008000, end = 0x002efc00
Using Device Tree in place at 00c00000, end 00c0bc21
Adding bank: 0x00000000 - 0x04000000 (size: 0x04000000)
Total: 552.203/758.717 ms
Starting kernel ...
怎么做才能把uart2改成数据串口？在其它的串口也不进行改动的情况下，因为我并不需要调试串口
如果哪里配置有问题无法登录adb或者ssh调试串口就是最后可以登录终端的方案，修改起来也很复杂很多客户都会因为缺少细节导致修改失败，我们不推荐修改。
内核前还有打印日志就是ddr.bin没有修改成功，你参考的viewtopic.php?t=975中的操作步骤我已经验证过多次，请检查5 Check if the modification was successful是否成功且烧录相关的镜像都要确定是修改后的
内核前还有打印日志就是ddr.bin没有修改成功，你参考的viewtopic.php?t=975中的操作步骤我已经验证过多次，请检查5 Check if the modification was successful是否成功且烧录相关的镜像都要确定是修改后的