[U-Boot] ARM64 Allwinner Binary Size

[Tom Rini <trini@konsulko.com>]

On Tue, Dec 19, 2017 at 03:09:52PM +0100, Maxime Ripard wrote:
> On Tue, Dec 19, 2017 at 08:30:31AM -0500, Tom Rini wrote:
> > On Tue, Dec 19, 2017 at 02:26:40PM +0100, Maxime Ripard wrote:
> > > 1;5002;0c
> > > On Tue, Dec 19, 2017 at 08:15:31AM -0500, Tom Rini wrote:
> > > > On Tue, Dec 19, 2017 at 02:12:02PM +0100, Maxime Ripard wrote:
> > > > > 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).
> > > > 
> > > > You want to keep sha256 support in FIT images, we only have dropping
> > > > that allowed for some very odd use-cases.  And while I don't have a
> > > > strong opinion about unzip, lzma is one of the valid/likelu compressions
> > > > for an Image (and aside, I, or someone, needs to look into having
> > > > 'booti' recognize various compression algorithms and automatically
> > > > decompress them) so I don't think we should get rid of that.
> > > 
> > > So, adding back CMD_LZMADEC and FIT_ENABLE_SHA256_SUPPORT, we're at
> > > 499kB. Still tight, but it fits.
> > 
> > Looking over myself, perhaps drop CMD_BOOTD and move LOGLEVEL to 3?
> 
> And we're at 498kB now! :)
> 
> Is CMD_ELF useful as well?

That's a good question.  In 32bit land, that's how you're going to
launch FreeRTOS and proprietary apps and so forth.  I don't know if for
aarch64 people will still be doing ELF applications or UEFI applications
for all of this.

-- 
Tom
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