46 lines
2 KiB
Markdown
46 lines
2 KiB
Markdown
# Kernel for Raspberry Pi 32 bits (in sync with official bullseye repo)
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This repository holds a pre-built 32 bits Linux bits kernel image for the Raspberry Pi, compiled from https://github.com/raspberrypi/linux, for usage by the [gokrazy](https://github.com/gokrazy/gokrazy) project.
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To use the files in this repository, adjust the `-kernel_package`
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of `gokr-packer`:
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```
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GOARCH=arm gokr-packer \
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-kernel_package=github.com/gokrazy-community/kernel-rpi-os-32/dist \
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github.com/gokrazy/hello
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```
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## How does it differ from https://github.com/gokrazy/kernel ?
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| | gokrazy-community/kernel-rpi-os-32 | gokrazy/kernel |
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| ------------ | ---------------------------------- | -------------- |
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| architecture | ARMv6 32-bit | ARMv8 64-bit |
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| upstream | linux Raspberry Pi OS fork | linux mainline |
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This kernel can be used by the oldest Raspberry Pi and follows the release cycles of the Raspberry Pi foundation.
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## Manual compilation
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```
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go run cmd/compile/main.go
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```
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It will compile the kernel located in `linux-sources` using a [crossbuild docker image](https://github.com/gokrazy-community/crossbuild-armhf) and copy the resulting files in the `dist` folder.
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It uses default kernel config (`make bcmrpi_defconfig`), as recommended by the [official documentation](https://www.raspberrypi.com/documentation/computers/linux_kernel.html#cross-compiling-the-kernel), with the addition of the SquashFS module (`CONFIG_SQUASHFS`, which is required for gokrazy) and `CONFIG_IPV6`.
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Further additions include the `CONFIG_W1`, `W1_MASTER_GPIO`, `W1_SLAVE_THERM` and `GPIOLIB`.
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## Update check
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```
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go run cmd/check-update/main.go
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```
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It will compare the kernel version distributed on https://archive.raspberrypi.org/debian/ with the `linux-sources` submodule current HEAD.
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## Licenses
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- The `vmlinuz` and `*.dtb` files are built from [Linux kernel sources](https://github.com/raspberrypi/linux), released under the GPL (see `linux-sources/COPYING`)
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- The rest of the repository is released under BSD 3-Clause License (see `LICENSE`)
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