升级Yocto至Scarthgap时U-Boot TPL启动失败，疑为设备树问题

问题背景 #

正在将Yocto构建从Kirkstone版本升级到Scarthgap版本，此前Kirkstone可正常生成可启动镜像。升级过程中遇到U-Boot相关问题：默认的2024.10版本Makefile已移除RK3399支持，因此改用2023.07.02版本。使用该版本启动时，设备卡在U-Boot TPL阶段，调试输出显示多个设备树节点匹配失败。推测可能是完整设备树而非精简（扁平化）版本进入了TPL，尽管defconfig中已配置CONFIG_OF_SPL_REMOVE_PROPS="pinctrl-0 pinctrl-names clock-names interrupt-parent assigned-clocks assigned-clock-rates assigned-clock-parents"，但问题仍未解决。

调试输出 #

U-Boot TPL 2023.07.02 (Oct 24 2024 - 14:13:42)
ofnode_read_prop: assigned-clock-rates: <not found>
bind node aliases
Device 'aliases' has no compatible string
bind node mmc@fe320000
   - attempt to match compatible string 'rockchip,rk3399-dw-mshc'
   - attempt to match compatible string 'rockchip,rk3288-dw-mshc'
No match for node 'mmc@fe320000'
bind node mmc@fe330000
   - attempt to match compatible string 'rockchip,rk3399-sdhci-5.1'
   - attempt to match compatible string 'arasan,sdhci-5.1'
No match for node 'mmc@fe330000'
bind node serial@ff180000
   - attempt to match compatible string 'rockchip,rk3399-uart'
   - attempt to match compatible string 'snps,dw-apb-uart'
   - found match at 'ns16550_serial': 'ns16550' matches 'snps,dw-apb-uart'
bind node serial@ff1a0000
   - attempt to match compatible string 'rockchip,rk3399-uart'
   - attempt to match compatible string 'snps,dw-apb-uart'
   - found match at 'ns16550_serial': 'ns16550' matches 'snps,dw-apb-uart'
bind node power-management@ff310000
   - attempt to match compatible string 'rockchip,rk3399-pmu'
   - found match at 'rk3399_syscon': 'rockchip,rk3399-grf' matches 'rockchip,rk3399-pmu'
bind node syscon@ff320000
   - attempt to match compatible string 'rockchip,rk3399-pmugrf'
   - found match at 'rk3399_syscon': 'rockchip,rk3399-grf' matches 'rockchip,rk3399-pmugrf'
bind node pmu-clock-controller@ff750000
   - attempt to match compatible string 'rockchip,rk3399-pmucru'
   - found match at 'rockchip_rk3399_pmucru': 'rockchip,rk3399-pmucru' matches 'rockchip,rk3399-pmucru'
bind node clock-controller@ff760000
   - attempt to match compatible string 'rockchip,rk3399-cru'
   - found match at 'rockchip_rk3399_cru': 'rockchip,rk3399-cru' matches 'rockchip,rk3399-cru'
bind node syscon@ff770000
   - attempt to match compatible string 'rockchip,rk3399-grf'
   - found match at 'rk3399_syscon': 'rockchip,rk3399-grf' matches 'rockchip,rk3399-grf'
bind node phy@f780
   - attempt to match compatible string 'rockchip,rk3399-emmc-phy'
No match for node 'phy@f780'
bind node vop@ff8f0000
   - attempt to match compatible string 'rockchip,rk3399-vop-lit'
No match for node 'vop@ff8f0000'
bind node vop@ff900000
   - attempt to match compatible string 'rockchip,rk3399-vop-big'
No match for node 'vop@ff900000'
bind node pinctrl
   - attempt to match compatible string 'rockchip,rk3399-pinctrl'
No match for node 'pinctrl'
bind node chosen
Device 'chosen' has no compatible string
bind node syscon@ff620000
   - attempt to match compatible string 'rockchip,rk3399-cic'
   - found match at 'rk3399_syscon': 'rockchip,rk3399-grf' matches 'rockchip,rk3399-cic'
bind node dfi@ff630000
   - attempt to match compatible string 'rockchip,rk3399-dfi'
No match for node 'dfi@ff630000'
bind node dmc
   - attempt to match compatible string 'rockchip,rk3399-dmc'
   - found match at 'rockchip_rk3399_dmc': 'rockchip,rk3399-dmc' matches 'rockchip,rk3399-dmc'
bind node syscon@ff330000
   - attempt to match compatible string 'rockchip,rk3399-pmusgrf'
   - found match at 'rk3399_syscon': 'rockchip,rk3399-grf' matches 'rockchip,rk3399-pmusgrf'
ofnode_read_u32_array: rockchip,sdram-params: ofnode_read_prop: reg: ofnode_read_bool: little-endian: false
ofnode_read_bool: big-endian: false
ofnode_read_bool: native-endian: false
ofnode_read_prop: assigned-clock-rates: <not found>
ofnode_read_prop: reg: ofnode_read_bool: little-endian: false
ofnode_read_bool: big-endian: false
ofnode_read_bool: native-endian: false
ofnode_read_prop: assigned-clock-rates: <not found>
ofnode_read_prop: reg: ofnode_read_bool: little-endian: false
ofnode_read_bool: big-endian: false
ofnode_read_bool: native-endian: false
ofnode_read_prop: assigned-clock-rates: <not found>
ofnode_read_prop: reg: ofnode_read_bool: little-endian: false
ofnode_read_bool: big-endian: false
ofnode_read_bool: native-endian: false
ofnode_read_prop: assigned-clock-rates: <not found>
ofnode_read_prop: reg: ofnode_read_bool: little-endian: false
ofnode_read_bool: big-endian: false
ofnode_read_bool: native-endian: false
ofnode_read_prop: assigned-clock-rates: <not found>
ofnode_read_prop: reg: ofnode_read_bool: little-endian: false
ofnode_read_bool: big-endian: false
ofnode_read_bool: native-endian: false
ofnode_read_prop: assigned-clock-rates: <not found>
ofnode_read_prop: assigned-clock-rates: <not found>
ofnode_read_prop: assigned-clock-rates: <not found>
ofnode_read_prop: assigned-clock-rates: <not found>
ofnode_read_prop: assigned-clock-rates: <not found>
Looking for clock-controller@ff760000
Looking for clock-controller@ff760000
   - result for clock-controller@ff760000: clock-controller@ff760000 (ret=0)
   - result for clock-controller@ff760000: clock-controller@ff760000 (ret=0)

排查建议 #

• 检查SPL/TPL设备树生成逻辑：在Yocto的devicetree.bbappend中添加TPL专属的设备树裁剪规则，比如通过DTC_FLAGS移除TPL不需要的节点，确保传递给TPL的是精简后的设备树
• 验证CONFIG_OF_SPL_REMOVE_PROPS配置：编译U-Boot后查看最终生成的.config文件，确认该配置是否被正确保留，避免被其他配置项覆盖
• 确认U-Boot 2023.07.02对RK3399的TPL支持：该版本可能要求使用单独的tpl.dtsi设备树片段，而非直接复用主设备树，需检查RK3399的U-Boot源码是否有相关要求
• 启用扁平化设备树配置：确保U-Boot defconfig中开启CONFIG_OF_FLAT_TREE，避免未扁平化的设备树进入TPL阶段
• 对比Kirkstone版本的U-Boot配置：找出两个版本中TPL相关配置的差异，比如是否有额外的设备树裁剪脚本、专属配置项等

内容的提问来源于stack exchange，提问作者Citrullin