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

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Date: Fri, 31 May 2024 12:00:07 +0200
From: Stefan Wahren <wahrenst@....net>
To: Andrea della Porta <andrea.porta@...e.com>, Rob Herring
 <robh@...nel.org>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>,
 Florian Fainelli <florian.fainelli@...adcom.com>, Ray Jui
 <rjui@...adcom.com>, Scott Branden <sbranden@...adcom.com>,
 Broadcom internal kernel review list
 <bcm-kernel-feedback-list@...adcom.com>, Ulf Hansson
 <ulf.hansson@...aro.org>, Adrian Hunter <adrian.hunter@...el.com>,
 Kamal Dasu <kamal.dasu@...adcom.com>, Al Cooper <alcooperx@...il.com>,
 devicetree@...r.kernel.org, linux-rpi-kernel@...ts.infradead.org,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 linux-mmc@...r.kernel.org
Subject: Re: [PATCH v5 0/4] Add minimal boot support for Raspberry Pi 5

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?