[U-Boot] Maximum size of u-boot.imx for TBS2910 board

Tom Rini
2019-11-22T00:32:59Z

On Fri, Nov 22, 2019 at 01:23:56AM +0100, Marek Vasut wrote:
> On 11/21/19 11:45 PM, Tom Rini wrote:
> > On Thu, Nov 21, 2019 at 11:01:43PM +0100, Marek Vasut wrote:
> >> On 11/21/19 10:59 PM, Heinrich Schuchardt wrote:
> >>> On 11/21/19 9:12 PM, Tom Rini wrote:
> >>>> On Thu, Nov 21, 2019 at 09:09:29PM +0100, Heinrich Schuchardt wrote:
> >>>>> Hello Soeren,
> >>>>>
> >>>>> when trying to add support for function key support in the USB keyboard
> >>>>> driver u-boot.imx for the TBS2910 surpassed the maximum size for
> >>>>> u-boot.imx.
> >>>>> https://travis-ci.org/marex/u-boot-usb/builds/614059004
> >>>>>
> >>>>> Do you remember why on the TBS2910 board this size is limited to
> >>>>> 0x5fc00? Other i.MX6 boards like the Wandboard allow a much larger
> >>>>> u-boot.imx.
> >>>>>
> >>>>> The limit is defined here:
> >>>>> include/configs/tbs2910.h:80:
> >>>>> #define CONFIG_BOARD_SIZE_LIMIT 392192 /* (CONFIG_ENV_OFFSET - 1024) */
> >>>>>
> >>>>> Could the value CONFIG_ENV_OFFSET=0x60000 be enlarged?
> >>>>>
> >>>>> Many i.MX6 defconfigs use CONFIG_ENV_OFFSET=0xC0000.
> >>>>
> >>>> The nature of these boards (aimed at end users) means that we just do
> >>>> not want to / cannot really move the stored environment.Â  Thanks!
> >>>
> >>> Another possibility would be to reduce the image size by using
> >>> CONFIG_REGEX=n which should be fine for a board with only one supported
> >>> network interface.
> >>
> >> But the board was fine before your patchset got applied and this is just
> >> a workaround for added bloat, which reduces functionality. I dislike
> >> trading functionality for bloat, sorry.
> >
> > One persons "bloat" is another persons "added functionality".
>
> It would seem this board did not suffer from the lack of this particular
> functionality before, and I would say that a board should stay at least
> as functional as it was when it was added. Replacing existing
> functionality with random unrelated new one makes no sense.

Was it tho? I believe we're talking about supporting some additional
keys via USB keyboard. This board does in fact expect users to be at
the U-Boot prompt via USB keyboard.

> > I believe
> > the specific changes in question that once again push this board over
> > fall in to that grey area. Whatever size-trimming the board maintainer
> > is fine with next is fine with me, but needs to get ack'd by someone.
>
> Or, the other option is, make these new extra features configurable and
> disable them on this board. And so there should be no size problem.

But that direction leads to saying every slight bit of functionality
requires a new Kconfig entry. Some levels of bugfixes as well.

--
Tom
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