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Kernel Build fix wrong path and missing quotes #4328

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28 changes: 14 additions & 14 deletions documentation/asciidoc/computers/linux_kernel/building.adoc
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Original file line number Diff line number Diff line change
Expand Up @@ -409,14 +409,14 @@ Next, install the kernel modules onto the boot media:
+
[source,console]
----
$ sudo env PATH=$PATH make -j12 ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- INSTALL_MOD_PATH=mnt/root modules_install
$ sudo env "PATH=$PATH" make -j12 ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- INSTALL_MOD_PATH=mnt/root modules_install
----

* For 32-bit kernels:
+
[source,console]
----
$ sudo env PATH=$PATH make -j12 ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- INSTALL_MOD_PATH=mnt/root modules_install
$ sudo env "PATH=$PATH" make -j12 ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- INSTALL_MOD_PATH=mnt/root modules_install
----

TIP: On multi-core devices, the `make -j<n>` option distributes work between cores. This can speed up compilation significantly. Run `nproc` to see how many processors you have; we recommend passing a number 1.5x your number of processors.
Expand All @@ -429,11 +429,11 @@ To install the 64-bit kernel:
+
[source,console]
----
$ sudo cp mnt/boot/$KERNEL.img mnt/boot/$KERNEL-backup.img
$ sudo cp arch/arm64/boot/Image mnt/boot/$KERNEL.img
$ sudo cp arch/arm64/boot/dts/broadcom/*.dtb mnt/boot/
$ sudo cp arch/arm64/boot/dts/overlays/*.dtb* mnt/boot/overlays/
$ sudo cp arch/arm64/boot/dts/overlays/README mnt/boot/overlays/
$ sudo cp mnt/boot/$KERNEL.img mnt/boot/firmware/$KERNEL-backup.img

@lurch lurch Oct 1, 2026

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The paths here match up with the instructions above where it says "First, mount these partitions as mnt/boot and mnt/root". These aren't the paths that these directories appear at under Raspberry Pi OS.

$ sudo cp arch/arm64/boot/Image mnt/boot/firmware/$KERNEL.img
$ sudo cp arch/arm64/boot/dts/broadcom/*.dtb mnt/boot/firmware/
$ sudo cp arch/arm64/boot/dts/overlays/*.dtb* mnt/boot/firmware/overlays/
$ sudo cp arch/arm64/boot/dts/overlays/README mnt/boot/firmware/overlays/
$ sudo umount mnt/boot
$ sudo umount mnt/root
----
Expand All @@ -444,29 +444,29 @@ To install the 32-bit kernel:
+
[source,console]
----
$ sudo cp mnt/boot/$KERNEL.img mnt/boot/$KERNEL-backup.img
$ sudo cp arch/arm/boot/zImage mnt/boot/$KERNEL.img
$ sudo cp mnt/boot/$KERNEL.img mnt/boot/firmware/$KERNEL-backup.img
$ sudo cp arch/arm/boot/zImage mnt/boot/firmware/$KERNEL.img
----

. Depending on your xref:linux_kernel.adoc#identify-your-kernel-version[kernel version], run the following command to install Device Tree blobs:
** For kernels up to version 6.4:
+
[source,console]
----
$ sudo cp arch/arm/boot/dts/*.dtb mnt/boot/
$ sudo cp arch/arm/boot/dts/*.dtb mnt/boot/firmware
----
** For kernels version 6.5 and above:
+
[source,console]
----
$ sudo cp arch/arm/boot/dts/broadcom/*.dtb mnt/boot/
$ sudo cp arch/arm/boot/dts/broadcom/*.dtb mnt/boot/firmware
----
. Finally, install the overlays and README, and unmount the partitions:
+
[source,console]
----
$ sudo cp arch/arm/boot/dts/overlays/*.dtb* mnt/boot/overlays/
$ sudo cp arch/arm/boot/dts/overlays/README mnt/boot/overlays/
$ sudo cp arch/arm/boot/dts/overlays/*.dtb* mnt/boot/firmware/overlays/
$ sudo cp arch/arm/boot/dts/overlays/README mnt/boot/firmware/overlays/
$ sudo umount mnt/boot
$ sudo umount mnt/root
----
Expand All @@ -493,4 +493,4 @@ If you don't provide a matching filename, you must specify the ramdisk using an
[source,ini]
----
initramfs <filename> followkernel
----
----