我目前已经为橙色pi零板(一种我用于研究的廉价中国板(构建了Yocto核心最小图像(带有meta sunxi(
https://github.com/linux-sunxi/meta-sunxi
它成功地在我的主板上启动，但在/dev/目录中，我无法访问SPI NOR内存。在orange pi wiki上搜索后，我发现我需要一些行到我的设备树：https://linux-sunxi.org/Orange_Pi_Zero#Installing_from_linux
&spi0 {
status = "okay";
flash: m25p80@0 {
#address-cells = <1>;
#size-cells = <1>;
compatible = "winbond,w25q128";
reg = <0>;
spi-max-frequency = <40000000>;
};
}；
但我真的不明白该怎么办。。。因为我找不到需要编辑的文件？也许这不是个好主意？我认为最好创建一个.bappend食谱，不是吗？
我通过在meta sunxi目录中搜索收集的信息：
在conf/orgnge pi zero/KERNEL_DEVICETREE="sun8i-h2-plus-orangepi-zzero.dtb"但是在meta sunxi目录中没有"sun8i-h2-plus-orangepi-zzero.dts"文件？
"sun8i-h2-plus-orangepi-zzero.dtb"文件存在于/build/tmp/deploy/images/orange-pi-zero/中，所以我真的不知道它是如何生成的？它只由yocto下载吗？(没有设备树编译？(
serachin在网上找到了sun8i-h2-plus-orangepi-zero.dts，网址：https://github.com/torvalds/linux/blob/master/arch/arm/boot/dts/sun8i-h2-plus-orangepi-zero.dts
它包含了以下有趣的行：
&spi0 {
/* Disable SPI NOR by default: it optional on Orange Pi Zero boards */
status = "disabled";
flash@0 {
#address-cells = <1>;
#size-cells = <1>;
compatible = "mxicy,mx25l1606e", "winbond,w25q128";
reg = <0>;
spi-max-frequency = <40000000>;
};
}；
所以也许有人能给我一些建议，在我的董事会上添加SPI NOR支持？什么是最好的方法？做一些。bbappend？还是通过复制"meta sunxi"并编辑它来创建我自己的meta？然后我需要编辑哪些文件？
提前感谢您的时间
皮埃尔。
使用带有元BSP层的Yocto编译图像会拉取内核(checksout到tmp/work-shared/<MACHINE>/kernel-source/中(并进行编译，您可以从tmp/deploy/images/<MACHINE>/中获得最终的输出图像。但在您的情况下，主流内核默认情况下不会启用SPI，因此您需要在Linux内核源代码中启用它。
如果您已经安装了Yocto内部版本，那么您可以编辑设备树并准备补丁。您可以进入tmp/work-shared/orange-pi-zero/kernel-source/，编辑内核源代码并更改
status = "okay";
并使用通常的序列准备git补丁
git add arch/arm/boot/dts/sun8i-h2-plus-orangepi-zero.dts
git commit -s -m "Enable SPI by default"
git format-patch HEAD~
然后用两种方式附加此补丁。
- 编辑
recipes-kernel/linux/linux-mainline_git.bb并将您的补丁文件添加到SRC_URI中。将补丁文件复制到recipes-kernel/linux/linux-mainline - 如果您不想编辑元sunxi层，请在元层中创建
linux-mainline_%.bbappend并执行同样的操作
下面的补丁可以直接应用于meta sunxi来修复这种情况。你可以在这里找到同样的东西。
From 3a1a3515d33facdf8ec9ab9735fb9244c65521be Mon Sep 17 00:00:00 2001
From: Parthiban Nallathambi <parthiban@linumiz.com>
Date: Sat, 10 Nov 2018 12:20:41 +0100
Subject: [PATCH] orange pi zero: Add SPI support by default
Signed-off-by: Parthiban Nallathambi <parthiban@linumiz.com>
---
...rm-dts-enable-SPI-for-orange-pi-zero.patch | 26 +++++++++++++++++++
recipes-kernel/linux/linux-mainline_git.bb | 1 +
2 files changed, 27 insertions(+)
create mode 100644 recipes-kernel/linux/linux-mainline/0001-arm-dts-enable-SPI-for-orange-pi-zero.patch
diff --git a/recipes-kernel/linux/linux-mainline/0001-arm-dts-enable-SPI-for-orange-pi-zero.patch b/recipes-kernel/linux/linux-mainline/0001-arm-dts-enable-SPI-for-orange-pi-zero.patch
new file mode 100644
index 0000000..e6d7933
--- /dev/null
+++ b/recipes-kernel/linux/linux-mainline/0001-arm-dts-enable-SPI-for-orange-pi-zero.patch
@@ -0,0 +1,26 @@
+From 1676d9767686404211c769de40e6aa55642b63d5 Mon Sep 17 00:00:00 2001
+From: Parthiban Nallathambi <parthiban@linumiz.com>
+Date: Sat, 10 Nov 2018 12:16:36 +0100
+Subject: [PATCH] arm: dts: enable SPI for orange pi zero
+
+Signed-off-by: Parthiban Nallathambi <parthiban@linumiz.com>
+---
+ arch/arm/boot/dts/sun8i-h2-plus-orangepi-zero.dts | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/arch/arm/boot/dts/sun8i-h2-plus-orangepi-zero.dts b/arch/arm/boot/dts/sun8i-h2-plus-orangepi-zero.dts
+index 0bc031fe4c56..0036065da81c 100644
+--- a/arch/arm/boot/dts/sun8i-h2-plus-orangepi-zero.dts
++++ b/arch/arm/boot/dts/sun8i-h2-plus-orangepi-zero.dts
+@@ -144,7 +144,7 @@
+
+ &spi0 {
+ /* Disable SPI NOR by default: it optional on Orange Pi Zero boards */
+- status = "disabled";
++ status = "okay";
+
+ flash@0 {
+ #address-cells = <1>;
+--
+2.17.2
+
diff --git a/recipes-kernel/linux/linux-mainline_git.bb b/recipes-kernel/linux/linux-mainline_git.bb
index 5b8e321..9b2bcbe 100644
--- a/recipes-kernel/linux/linux-mainline_git.bb
+++ b/recipes-kernel/linux/linux-mainline_git.bb
@@ -27,5 +27,6 @@ SRCREV_pn-${PN} = "b04e217704b7f879c6b91222b066983a44a7a09f"
SRC_URI = "git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git;protocol=git;branch=master
file://defconfig
+ file://0001-arm-dts-enable-SPI-for-orange-pi-zero.patch
"
S = "${WORKDIR}/git"
--
2.17.2