[U-Boot] Please pull u-boot-dm

[Tom Rini]

On Thu, Oct 18, 2018 at 09:27:49PM -0600, Simon Glass wrote:
> Hi,
> 
> On 17 October 2018 at 11:14, Stephen Warren <swarren at wwwdotorg.org> wrote:
> > On 10/16/18 8:33 PM, Bin Meng wrote:
> >>
> >> On Wed, Oct 17, 2018 at 7:01 AM Bin Meng <bmeng.cn at gmail.com> wrote:
> >>>
> >>>
> >>> Hi Stephen,
> >>>
> >>> On Wed, Oct 17, 2018 at 12:27 AM Stephen Warren <swarren at wwwdotorg.org>
> >>> wrote:
> >>>>
> >>>>
> >>>> On 10/15/18 5:43 PM, Bin Meng wrote:
> >>>>>
> >>>>> Hi Stephen,
> >>>>>
> >>>>> On Tue, Oct 16, 2018 at 6:43 AM Stephen Warren <swarren at wwwdotorg.org>
> >>>>> wrote:
> >>>>>>
> >>>>>>
> >>>>>> On 10/15/18 3:53 PM, Stephen Warren wrote:
> >>>>>>>
> >>>>>>> On 10/15/18 2:17 PM, Simon Glass wrote:
> >>>>>>>>
> >>>>>>>> Hi Tom,
> >>>>>>>>
> >>>>>>>> The following changes since commit
> >>>>>>>> 6e7a186dc5d50f563e224e9ae7be70defff7ee0d:
> >>>>>>>>
> >>>>>>>>      Merge tag 'arc-more-updates-for-2018.11-rc2-2' of
> >>>>>>>> git://git.denx.de/u-boot-arc (2018-10-15 07:20:07 -0400)
> >>>>>>>>
> >>>>>>>> are available in the Git repository at:
> >>>>>>>>
> >>>>>>>>      git://git.denx.de/u-boot-dm.git tags/pull-15oct-18
> >>>>>>>>
> >>>>>>>> for you to fetch changes up to
> >>>>>>>> 02f2d266c75106a2fefd1f4e8e6f703fe00ed21d:
> >>>>>>>>
> >>>>>>>>      buildman: Add a --boards option to specify particular boards to
> >>>>>>>> build (2018-10-15 08:20:43 -0600)
> >>>>>>>
> >>>>>>>
> >>>>>>> There's something wrong with these patches; both Jetson TX1 and
> >>>>>>> Jetson
> >>>>>>> TX2 (both 64-bit ARM without SPL) fail to boot with this branch; the
> >>>>>>> system hangs with no output at all from U-Boot. Jetson TK1 (32-bit
> >>>>>>> ARM
> >>>>>>> with SPL) and sandbox boot fine.
> >>>>>>
> >>>>>>
> >>>>>> Reverting the following solves the issue:
> >>>>>>
> >>>>>> 1) dm: core: Mirror the chosen node parse logic in the livetree
> >>>>>> scanning
> >>>>>>
> >>>>>> 2) dm: core: Respect drivers with the DM_FLAG_PRE_RELOC flag in
> >>>>>> lists_bind_fdt()
> >>>>>>
> >>>>>> Reverting just (1) or just (2) does not. Can you please take a look?
> >>>>>> Thanks.
> >>>>>
> >>>>>
> >>>>> The failure is probably due to some drivers that Tegra uses are not
> >>>>> properly written, ie: these drivers are declared via U_BOOT_DRIVER
> >>>>> with flags DM_FLAG_PRE_RELOC yet it was never working (bound before
> >>>>> relocation) until patch (1) & (2). Now these drivers get bound before
> >>>>> relocation but they were never bound before (assume they were never
> >>>>> required before relocation), so we should identify which driver were
> >>>>> wrongly written, but as a quick solution, can you please enlarge the
> >>>>> CONFIG_SYS_MALLOC_F_LEN of your board and have a try?
> >>>>
> >>>>
> >>>> Yes, bumping CONFIG_SYS_MALLOC_F_LEN from 0x1800 to 0x1a90 solves the
> >>>> issue. Alternatively, removing DM_FLAG_PRE_RELOC in tegra_gpio.c or
> >>>> tegra186_gpio.c (depending on board/SoC) also solves this.
> >>>>
> >>>> I suppose the correct solution is to remove the DM flag from the driver,
> >>>> since if it never used to work before your patches, it's clear that the
> >>>> flag/feature is not actually required.
> >>>
> >>>
> >>> Thank you Stephen. I will prepare a patch to update the tegra*_gpio
> >>> driver.
> 
> Thanks Bin,
> 
> >>
> >>
> >> Ah, it turns out so many drivers/dts are mis-written ...
> >>
> >> For example, the driver has the DM_FLAG_PRE_RELOC flag, and the dts
> >> file also has "u-boot,dm-pre-reloc". The "u-boot,dm-pre-reloc" must
> >> have been added to workaround the DM bug (fixed in patch 1 & 2
> >> mentioned in this thread). But now since the DM bug has been fixed,
> >> these "u-boot,dm-pre-reloc" properties are really unnecessary but I am
> >> afraid I don't have the knowledge to clean up all of these.
> >>
> >> Of course, I've identified some additional drivers that have
> >> DM_FLAG_PRE_RELOC flag set but dts file doesn't have
> >> "u-boot,dm-pre-reloc". These drivers should be updated to remove the
> >> DM_FLAG_PRE_RELOC flag like the Tegra GPIO drivers.
> >
> >
> > I don't see any cases where u-boot,dm-pre-reloc exists in DT for the Tegra
> > GPIO driver specifically, so I think a simple patch removing the
> > DM_FLAG_PRE_RELOC flag from the two Tegra GPIO drivers would be fine. Of
> > course, I didn't look at any non-Tegra DTs, or at drivers other than Tegra
> > GPIO.
> 
> OK.
> 
> I tend to agree that it is getting a bit late. I am considering
> delaying this pull request until the next merge window. I still have
> regmap and virtio to bring in. Tom, what do you think?
> 

Start the PR over and look for things it really makes sense to grab at
-rc2 (bugfixes, Kconfig migrations, etc) is what I think we need to do
at this point, thanks!

-- 
Tom
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