[U-Boot] ARM64 Allwinner Binary Size

Maxime Ripard
2017-12-19T15:24:59Z

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.

Maxime

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