[PATCH v2 2/2] board: mntre: imx8mq: Add MNT Reform 2 board support

[Vagrant Cascadian]

On 2021-11-11, Patrick Wildt wrote:
> On Thu, Nov 11, 2021 at 12:21:26PM +0100, Patrick Wildt wrote:
>> On Wed, Nov 10, 2021 at 02:26:54PM -0800, Vagrant Cascadian wrote:
>> > On 2021-09-02, Patrick Wildt wrote:
>> > > The MNT Reform 2 is a modular DIY laptop.  In its initial version it
>> > > is based on the BoundaryDevices i.MX8MQ SoM.  Some parts have been
>> > > lifted from BoundaryDevices official U-Boot downstream project.
...
>> > Both simply hanging with:
>> > 
>> >   U-Boot SPL 2021.10 (Jan 01 1970 - 00:00:01 +0000)

Still hanging with the below patch...


>> There have been a few changes in U-Boot since I sent my patchset, it's
>> possible the diff by itself might not be enough.
>> 
>> I will send out a new patchset soon, but the move to Binman doesn't work
>> for me yet.  It's weird, because I don't see a diff to other i.MX8MQ
>> platforms, so I'm still debugging that.  Maybe the other i.MX8MQ boards
>> don't work with Binman either?
>> 
>> Keep note that the build procedure (how to supply bl31) changes once
>> Binman is used.
>
> I have fixed the issue.  My changes depend on Peng's patchset to change
> i.MX8MQ to Binman, so I will re-issue a v3 of the patchset as soon as
> that is done (to not interfere any further with his patchset).
>
> 'Attached' you'll find a complete diff you can apply to origin/master,
> which includes some of Peng's changes.  Let me know how it goes for you.

To get it to build, I needed to add this:

diff --git a/arch/arm/mach-imx/Makefile b/arch/arm/mach-imx/Makefile
index 07954bc201..e51b5317fc 100644
--- a/arch/arm/mach-imx/Makefile
+++ b/arch/arm/mach-imx/Makefile
@@ -161,9 +161,9 @@ spl/u-boot-spl.cfgout: $(IMX_CONFIG) FORCE
        $(Q)mkdir -p $(dir $@)
                $(call if_changed_dep,cpp_cfg)

-spl/u-boot-spl-ddr.bin: spl/u-boot-spl.bin spl/u-boot-spl.cfgout FORCE
+u-boot-spl-ddr.bin: spl/u-boot-spl.bin spl/u-boot-spl.cfgout FORCE

-flash.bin: spl/u-boot-spl-ddr.bin u-boot.itb FORCE
+flash.bin: u-boot-spl-ddr.bin u-boot.itb FORCE
        $(call if_changed,mkimage)
         endif


>> > Is the flash.bin step unecessary? I see DDR timing code in the patch
>> > series; are corresponding lpddr4*.bin no longer necessary?
>> 
>> The flash.bin has all bits: U-Boot, U-Boot SPL, lpddr4*.bin and bl31.bin
>> 
>> lpddr4*.bin is the firmware for the DDR controller.  So you need the
>> timing information *and* the firmware.
>> 
>> > I also tried building with an old version of arm-trusted-firmware
>> > (v2.2), as that was the most recent upstream version that successfully
>> > built. This seems to be a fork of ATF that has support for iMX8MQ, but
>> > it is unclear which branch/tag/etc. should be used with the mnt/reform:
>> > 
>> >   https://source.codeaurora.org/external/imx/imx-atf
>> 
>> Not sure right now, but I think I was using the one that's build on
>> OpenBSD-current, which seems to be arm-trusted-firmware 2.5.  I'll
>> check it.

I can't get atf 2.5 for imx8mq to build on Debian or GNU Guix; it seems
that maybe it is no longer supported upstream:

  https://git.trustedfirmware.org/TF-A/trusted-firmware-a.git/commit/?id=e3c07d2f5a082d8bb1684ca026d1789a77b3c870

Though it's not exactly clear what works...


>> > It would be nice to include a board README in the next patch revision to
>> > spell out some of the details of exactly which other projects and
>> > versions/comments/branches are expected to work with MNT Reform2.
>> > 
>> 
>> This is nothing specific to the MNT Reform2.  It's the same for all
>> i.MX8MQ boards.  ATF+DDR+U-Boot have to work together, and it doesn't
>> matter which board it is.  Hence I don't believe providing that kind
>> information in a Reform-specific README makes sense.

I guess we need a workable README for i.MX8MQ or something, and only
boards that differ from that process document the differences?

But at the moment, it appears to still be guesswork.


live well,
  vagrant
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