tools: Add mkimage-rpi3 to build images for raspberry Pi 3

The package contains u-boot and the RPi firmware blobs. It expects
a tar ball of the root filesystem (including kernel and dtbs) on stdin
and produces a compressed tar ball on stdout with the files to copy to
a FAT32 formatted SD card.

Signed-off-by: Rolf Neugebauer <rolf.neugebauer@docker.com>
This commit is contained in:
Rolf Neugebauer 2017-10-13 14:26:38 +01:00
parent 847ae9d220
commit c15f320ff6
6 changed files with 114 additions and 0 deletions

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FROM linuxkit/alpine:b3f8da6c6f02440ee9c4c72bbf4dabdf500b1d8c as build
RUN apk add \
bc \
dtc \
curl \
make \
gcc \
git \
musl-dev \
patch
# Create small rootfs
RUN mkdir -p /out/etc/apk && cp -r /etc/apk/* /out/etc/apk/
RUN apk add --no-cache --initdb -p /out \
alpine-baselayout \
busybox \
libarchive-tools \
musl \
tar
RUN rm -rf /out/etc/apk /out/lib/apk /out/var/cache
# u-boot compile. The patch is needed to handle larger kernels
ENV UBOOT_COMMIT=v2017.09
COPY u-boot.patch .
RUN git clone https://github.com/u-boot/u-boot.git && \
cd /u-boot && \
git checkout $UBOOT_COMMIT
WORKDIR /u-boot
RUN patch -p 1 < /u-boot.patch && \
make rpi_3_defconfig all && \
mkdir -p /out/boot && \
cp u-boot.bin /out/boot && \
mkdir -p /out/bin && \
cp tools/mkimage /out/bin
# fetch the Raspberry Pi 3 firmware (latest master)
ENV RPI_COMMIT=478d637c476e838ffcfa8535232ff0b86daf5918
RUN mkdir -p /out/boot && \
cd /out/boot && \
curl -fsSLO https://github.com/raspberrypi/firmware/raw/$RPI_COMMIT/boot/bootcode.bin && \
curl -fsSLO https://github.com/raspberrypi/firmware/raw/$RPI_COMMIT/boot/bootcode.bin && \
curl -fsSLO https://github.com/raspberrypi/firmware/raw/$RPI_COMMIT/boot/fixup_cd.dat && \
curl -fsSLO https://github.com/raspberrypi/firmware/raw/$RPI_COMMIT/boot/fixup.dat && \
curl -fsSLO https://github.com/raspberrypi/firmware/raw/$RPI_COMMIT/boot/fixup_x.dat && \
curl -fsSLO https://github.com/raspberrypi/firmware/raw/$RPI_COMMIT/boot/start_cd.elf && \
curl -fsSLO https://github.com/raspberrypi/firmware/raw/$RPI_COMMIT/boot/start.elf && \
curl -fsSLO https://github.com/raspberrypi/firmware/raw/$RPI_COMMIT/boot/start_x.elf
FROM scratch
ENTRYPOINT []
CMD []
WORKDIR /
COPY --from=build /out/ /
COPY config.txt boot.script /boot/
COPY make-rpi3 /
ENTRYPOINT [ "/make-rpi3" ]

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setenv bootargs "dwc_otg.lpm_enable=0 earlyprintk console=tty1 console=ttyS0,115200 root=/dev/ram0 rw"
setenv dtbfile bcm2837-rpi-3-b.dtb
setenv machid 0x00000c42
saveenv
fatload mmc 0:1 ${kernel_addr_r} kernel.uimg
fatload mmc 0:1 ${fdt_addr_r} ${dtbfile}
fatload mmc 0:1 ${ramdisk_addr_r} initrd.uimg
bootm ${kernel_addr_r} ${ramdisk_addr_r} ${fdt_addr_r}

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image: mkimage-rpi3
network: true
arches:
- arm64

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avoid_warnings=2
# 64bit mode, serial and kernel
arm_control=0x200
enable_uart=1
kernel=u-boot.bin

29
tools/mkimage-rpi3/make-rpi3 Executable file
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#!/bin/sh
set -e
# input is a tarball on stdin with kernel, dtbs and cmdline in /boot
# output is an tar to be extracted onto a SD card
mkdir -p /files
cd /files
# extract. BSD tar auto recognises compression
[ -t 0 ] || bsdtar xzf -
cd /
# copy/convert files
cp /files/boot/dtb/broadcom/bcm2837-rpi-3-b.dtb /boot
/bin/mkimage -A arm64 -O linux -T kernel -C gzip -a 0x80000 -e 0x80000 \
-d /files/boot/kernel /boot/kernel.uimg >> /boot/uboot.log
/bin/mkimage -A arm64 -O linux -T script -C none -a 0x00000000 -e 0x00000000 -n RPi3 \
-d /boot/boot.script /boot/boot.scr >> /boot/uboot.log
# build an initrd and convert it
rm -rf /files/boot
cd /files && find . | cpio -o -H newc | gzip > /initrd.img
/bin/mkimage -A arm64 -O linux -T ramdisk -d /initrd.img /boot/initrd.uimg >> /boot/uboot.log
# now everything is setup in /boot just need to tar it
cd /boot && tar cf - .

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diff --git a/include/configs/rpi.h b/include/configs/rpi.h
index c499b45..1faae3c 100644
--- a/include/configs/rpi.h
+++ b/include/configs/rpi.h
@@ -161,4 +161,6 @@
BOOTENV
+#define CONFIG_SYS_BOOTM_LEN (64 * 1024 * 1024)
+
#endif