[PATCH v5 0/4] Add minimal boot support for Raspberry Pi 5

[Ulf Hansson]

On Thu, 30 May 2024 at 12:11, Andrea della Porta <andrea.porta at suse.com> wrote:
>
> Hi,
>
> This patchset adds minimal support for the Broadcom BCM2712 SoC and for
> the on-board SDHCI controller on Broadcom BCM2712 in order to make it
> possible to boot (particularly) a Raspberry Pi 5 from SD card and get a
> console through uart.
> Changes to arm64/defconfig are not needed since the actual options work
> as they are.
> This work is heavily based on downstream contributions.
>
> Tested on Tumbleweed substituting the stock kernel with upstream one,
> either chainloading uboot+grub+kernel or directly booting the kernel
> from 1st stage bootloader. Steps to reproduce:
> - prepare an SD card from a Raspberry enabled raw image, mount the first
>   FAT partition.
> - make sure the FAT partition is big enough to contain the kernel,
>   anything bigger than 64Mb is usually enough, depending on your kernel
>   config options.
> - build the kernel and dtbs making sure that the support for your root
>   fs type is compiled as builtin.
> - copy the kernel image in your FAT partition overwriting the older one
>   (e.g. kernel*.img for Raspberry Pi OS or u-boot.bin for Tumbleweed).
> - copy arch/arm64/boot/dts/broadcom/bcm2712-rpi-5-b.dtb on FAT partition.
> - make sure you have a cmdline.txt file in FAT partition with the
>   following content:
>   # cat /boot/efi/cmdline.txt
>   root=/dev/mmcblk0p3 rootwait rw console=tty ignore_loglevel earlycon
>   console=ttyAMA10,115200
> - if you experience random SD issues during boot, try to set
>   initial_turbo=0 in config.txt.
>
>
> Changes in V5:
>
> DTS:
> - axi node merged into soc node
> - redefined the mapping ranges of the soc node to have proper translation,
>   and a narrower address and size cell number for child nodes.Child nodes
>   reg properties adjusted accordingly
> - augemented the comment in 'gio_aon' node
>
> sdhci-brcmstb.c:
> - removed unused 'base_clk_mhz' variable

Patch 1 ->3 from v5 applied for next, thanks!

[...]

Kind regards
Uffe