[U-Boot] ARM64 Allwinner Binary Size

Maxime Ripard
2017-12-20T07:15:46Z

On Wed, Dec 20, 2017 at 01:55:51AM +0000, AndrÃ© Przywara wrote:
> On 19/12/17 15:24, Maxime Ripard wrote:
> > On Tue, Dec 19, 2017 at 02:41:17PM +0100, Mark Kettenis wrote:
> >>> Date: Tue, 19 Dec 2017 14:12:02 +0100
> >>> From: Maxime Ripard <maxime.ripard@free-electrons.com>
> >>>
> >>> On Tue, Dec 05, 2017 at 10:28:20AM +0000, Andre Przywara wrote:
> >>>> So even though the actual u-boot.bin for 64-bit boards is still somewhat
> >>>> below the limit (~480KB), adding the ATF image (~32KB) pushes it over
> >>>> the edge. So since v2017.11 u-boot.itb is already too big for the
> >>>> traditional MMC env location.
> >>>
> >>> So I've had a quick look about what could go possibly go away in our
> >>> current armv8 config (using the pine64+ defconfig). Let me know if
> >>> some are actually vitals:
> >>>
> >>> - FIT_ENABLE_SHA256_SUPPORT
> >>> - CONSOLE_MUX
> >>> - CMD_CRC32
> >>> - CMD_LZMADEC
> >>> - CMD_UNZIP
> >>> - CMD_LOADB
> >>> - CMD_LOADS
> >>> - CMD_MISC (actually implementing the command sleep)
> >>> - ISO_PARTITION (yes. For CDROMs.)
> >>> - VIDEO_BPP8, VIDEO_BPP16
> >>> - VIDEO_ANSI
> >>> - SHA256
> >>> - LZMA
> >>>
> >>> Removing those options make the u-boot.itb binary size going from
> >>> 516kB to 478kB, making it functional again *and* allowing us to enable
> >>> the DT overlays that seem way more important than any feature
> >>> mentionned above (and bumps the size to 483kB).
> >>
> >> So without CONFIG_CONSOLE_MUX, what is the behaviour when both serial
> >> console and usb keyboard are present? Is the usb keyboard used when
> >> it is plugged in but serial otherwise?
> >
> > That's actually a very good question, and I don't know, I never used a
> > USB keyboard with U-Boot.
> >
> > This is enabled on 7 Allwinner boards, and no one complained so far,
> > so I would expect to work without that option activated. However, it
> > doesn't take that much space either, so it's not like we really need
> > to disable it either.
>
> Just tested it: without CONSOLE_MUX we don't use video and USB keyboard
> automatically. It seems to default to serial, "setenv stdout vidconsole"
> switches over (immediately). This is quite weird behaviour, and probably
> quite unpleasant for the casual user.
> With CONSOLE_MUX defined we get what we want: always serial console,
> plus USB keyboard and HDMI, if connected. Output appears on both, input
> is accepted from both.
> So I would very much like to keep it in.

Sounds like we should even enable it for everyone then.

Maxime

--
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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