From: Tom Rini <trini@konsulko.com>
To: Stephan Gerhold <stephan@gerhold.net>
Cc: u-boot@lists.denx.de, Linus Walleij <linus.walleij@linaro.org>
Subject: Re: [PATCH 2/2] board: stemmy: Copy atags for booting downstream/vendor kernel
Date: Wed, 14 Jul 2021 16:53:15 -0400 [thread overview]
Message-ID: <20210714205315.GF9516@bill-the-cat> (raw)
In-Reply-To: <20210707105855.89260-2-stephan@gerhold.net>
[-- Attachment #1: Type: text/plain, Size: 1669 bytes --]
On Wed, Jul 07, 2021 at 12:58:55PM +0200, Stephan Gerhold wrote:
> The U-Boot "stemmy" board is mainly intended to simplify booting
> mainline Linux on various smartphones from Samsung based on ST-Ericsson
> Ux500. While the mainline kernel is working great, there are still some
> features missing there. In particular, it is currently not possible to
> charge the battery when using the mainline kernel.
>
> This means that it is still necessary to boot the downstream/vendor
> kernel from Samsung sometimes to charge the device. That kernel is
> ancient, still uses board files + ATAGS instead of device trees and
> relies on a strange very long kernel command line hardcoded in the
> Samsung bootloader.
>
> Actually, since mainline is booted with device trees there is a very
> simple way to make the old downstream kernel work as well: We can
> simply take most of the ATAGS passed to U-Boot from the Samsung
> bootloader and copy them as-is when booting a kernel without device
> tree. That way the long command line and other needed ATAGS are copied
> as-is without having to bother with them.
>
> The only exception is the ATAG_INITRD - since the initrd is loaded
> by U-Boot, the atag for that should be generated in U-Boot so it points
> to the correct address. All other ATAGS are copied as-is and not
> generated in U-Boot.
>
> Also use the chance and provide a serial# for U-Boot by parsing the
> ATAG_SERIAL that is also passed by the Samsung bootloader.
>
> Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
> Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Applied to u-boot/master, thanks!
--
Tom
[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 659 bytes --]
next prev parent reply other threads:[~2021-07-14 20:56 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-07 10:58 [PATCH 1/2] board: stemmy: Parse atags to get available memory Stephan Gerhold
2021-07-07 10:58 ` [PATCH 2/2] board: stemmy: Copy atags for booting downstream/vendor kernel Stephan Gerhold
2021-07-07 23:54 ` Linus Walleij
2021-07-14 20:53 ` Tom Rini [this message]
2021-07-07 23:53 ` [PATCH 1/2] board: stemmy: Parse atags to get available memory Linus Walleij
2021-07-14 20:53 ` Tom Rini
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20210714205315.GF9516@bill-the-cat \
--to=trini@konsulko.com \
--cc=linus.walleij@linaro.org \
--cc=stephan@gerhold.net \
--cc=u-boot@lists.denx.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox