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

[Stefan Wahren <wahrenst@gmx.net>]

Hi Andrea,

Am 30.05.24 um 12:11 schrieb Andrea della Porta:
> 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.
was this an issue since the beginning of this series?

What kind of SD issues?

Is there a downstream reference?