Re: [PATCH 5/6] common: kconfig: raise SYS_CBSIZE default to 1024 for FSL_LSCH2/LSCH3

Tom Rini <[email protected]> Tue, 25 Aug 2026 08:20:10 -0600

Newsgroups	org.u-boot-project.lists.u-boot
Message-ID	<20260825142010.GT523975@bill-the-cat>

On Tue, Aug 25, 2026 at 11:19:38AM +0300, Vladimir Oltean wrote:
> On Tue, Aug 25, 2026 at 04:01:27PM +0800, Peng Fan wrote:
> > On Mon, Aug 24, 2026 at 03:28:24PM +0300, Vladimir Oltean wrote:
> > >The 512-byte console input buffer limit for Layerscape SoCs originates
> > >from copy-pasted boilerplate in the original LS2085A board support added
> > >in commit f749db3a75ec ("ARMv8/ls2085a_emu: Add LS2085A emulator and
> > >simulator board support"). No rationale was given for the 512-byte
> > >choice; every subsequent FSL_LSCH2 and FSL_LSCH3 common header
> > >(ls1043a, ls1046a, ls1088a, lx2160a, ...) inherited it by convention.
> > >
> > >When CONFIG_SYS_CBSIZE was moved to Kconfig in commit d31466b382dd
> > >("Convert CONFIG_SYS_CBSIZE to Kconfig"), the existing 512-byte values
> > >were transcribed mechanically into Kconfig defaults, cementing the
> > >limit without re-examining its validity.
> > >
> > >The practical consequence is that environment variables holding
> > >multi-step boot scripts are silently truncated at 510 usable characters
> > >on all Layerscape boards, making it impossible to store commands such
> > >as combined TFTP+flash sequences in a single variable.
> > >
> > >The same problem was already identified and fixed for i.MX6 and i.MX7
> > >in commit f7b237b81e5a ("MLK-24380 imx6: Enlarge the console I/O buffer
> > nit:
> > 
> > This is a downstream commit.
> > 
> > Regards
> > Peng
> 
> Correct, I failed to update the commit message when rebasing.
> 
> Would you prefer replacing the commit sha1sum reference with just
> "downstream", or just remove the justification altogether?

Adding in Fabio since that downstream commit is also applicable to
mainline too, for iMX6/7.

-- 
Tom

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