[U-Boot] Rockchip RK3288 u-boot with mainline kernel

[Rick Bronson <rick@efn.org>]

Hi Heiko and Simon,

  Again, thank you both for your help, I really appreciate it!

  The good news is that I finally got it to boot fully into mainline
u-boot.  I switched gears and tried miniarm-rk3288_defconfig which
doesn't use the CONFIG_SPL_OF_PLATDATA option.  So now my build looks
like:

u-boot-denx:
	cd $@; make miniarm-rk3288_defconfig CROSS_COMPILE="${CROSS_COMPILE}"
	cd $@; make ${MK_PAR} all CROSS_COMPILE="${CROSS_COMPILE}"
	$@/tools/mkimage -n rk3288 -T rksd -d $@/spl/u-boot-spl-dtb.bin
tftpboot/u-boot-dtb.bin; cat $@/u-boot-dtb.bin >> tftpboot/u-boot-dtb.bin

  and my flash looks like:

UPGD=./Linux_Upgrade_Tool_v1.21/upgrade_tool
	sudo ${UPGD} db rkbin/rk32/rk3288_boot.bin
	sleep 1
	sudo ${UPGD} wl 64 tftpboot/u-boot-dtb.bin
	sudo ${UPGD} rd

  So I'm pretty excited :)

  The strange thing is I still don't have emmc or my LED turning on
  from the device tree entry in rk3288-miniarm.dtsi (which I modified
  for my LED [ on GPIO0_B3]):

		pwr-led {
			gpios = <&gpio0 11 GPIO_ACTIVE_HIGH>;
			linux,default-trigger = "default-on";
		};

  Below is what I see when I boot.

  Cheers,

  Rick


U-Boot SPL 2016.11-00138-g136179b-dirty (Nov 29 2016 - 14:19:08)


U-Boot 2016.11-00138-g136179b-dirty (Nov 29 2016 - 14:19:08 -0800)

Model: Miniarm-RK3288
DRAM:  2 GiB
MMC:   dwmmc at ff0c0000: 0
Card did not respond to voltage select!
*** Warning - MMC init failed, using default environment

In:    serial
Out:   serial
Err:   serial
Net:   Net Initialization Skipped
No ethernet found.
Hit any key to stop autoboot:  0
=> md 0xFF750000 4
ff750000: 00000000 00000000 00000000 00000000    ................
=> md 0xFF790000 4
ff790000: 00000000 00000000 00000000 00000000    ................
=>


> Hi Rick,
>
> On 29 November 2016 at 11:22, Rick Bronson <rick@efn.org> wrote:
> > Hi Heiko and Simon,
> >
> >   Thank you both for your help, I really appreciate it.
> >
> >   No, I do not have the Linux mainline running yet as I was focusing
> > on getting the mainline u-boot running since I saw some references
> > that implied I may need that to use the mainline Linux.  I did try the
> > mainline kernel with the vendor-fork u-boot but got nothing pas the
> > "Loading Linux...." line from u-boot.
> >
> >   I think what I will probably do is take the easy way out and use the
> > vendor-fork u-boot since that boots on this hardware.
> >
> >   But since I've invested some amount of time in the mainline u-boot
> > and it's drinving me mad that I can't seem to figure out what's wrong,
> > I do have one last question (hopefully).
>
> It would certainly make sense to invest in getting this running if you can.
>
> >
> >   I've got mainline u-boot getting this far (I added debug to show
> > what GPIO0 and 2 are outputting).
> >
> > --------------------
> > U-Boot SPL 2016.11-00138-g136179b-dirty (Nov 28 2016 - 13:29:59)
> > Trying to boot from MMC1
> > Card did not respond to voltage select! GPIO0=0x0 GPIO2=0x0
> > ...
> > --------------------
> >
> >   I've modified rk3288-firefly.dts (the closest thing to hardware I
> > have) to set the eMMC reset line high but as you see above, nothing is
> > set on any GPIO.  This leads me to believe that I do not understand
> > how the device tree is loaded/used in SPL.  Can anyone point me to
> > help on whether I should use u-boot-spl-nodtb or u-boot-spl-dtb (I've
> > tried both) or how to debug if I am in fact even reading my dtb.
>
> You should be able to use 'gpio status' to see the GPIO state once you
> get to U-Boot.
>
> But if your board is booting SPL from MMC how can it possibly fail to
> load U-Boot from MMC? The MMC GPIO must already work for you to get
> this far. Or are you loading SPL from something other than MMC?
>
> You want u-boot-spl.bin (which includes the device tree).
>
> >
> >   Thanks again,
> >
> >   Rick
> >
> > PS.  My Makefile is here if you are so inclined:
> > http://members.efn.org/~rick/pub/Makefile  See the targets u-boot-denx
> > and uboot_new_flash to see what I've tried.
>
> You could push your tree somewhere or a patch showing what changes you
> have made.
>
> Regards,
> Simon
>
> >>
> >> From heiko at sntech.de Tue Nov 29 08:45:02 2016
> >> To: u-boot at lists.denx.de
> >> Cc: Simon Glass <sjg@chromium.org>, Rick Bronson <rick@efn.org>,
> > "eddie.cai" <eddie.cai@rock-chips.com>,
> > linux-rockchip at lists.infradead.org
> >> Subject: Re: [U-Boot] Rockchip RK3288 u-boot with mainline kernel
> >> Date: Tue, 29 Nov 2016 11:20:52 +0100
> >>
> >> Hi Rick,
> >>
> >> Am Montag, 28. November 2016, 15:09:05 schrieb Simon Glass:
> >> > + A few rockchip people and linux-rockchip
> >> >
> >> > Hi Rick,
> >> >
> >> > On 25 November 2016 at 11:20, Rick Bronson <rick@efn.org> wrote:
> >> > > Hi All,
> >> > >
> >> > >   I've got unsupported RK3288 hardware running the latest git
u-boot to
> >> > >
> >> > > SPL as explained in
> >> > > http://git.denx.de/?p=u-boot.git;a=blob;f=doc/README.rockchip. 
My goal
> >> > > is to run the mainline (ie. not Android) Linux kernel on this
hardware
> >> > >
> >> > > and wondered:
> >> > >  - Do I need to get the latest git u-boot to run before I can run
the
> >> > >
> >> > > mainline kernel?  Or can I use
> >> > > github.com/linux-rockchip/u-boot-rockchip.git, which I have running
> >> > > u-boot fully.
> >> >
> >> > It's up to you - obviously mainline is where the development should
> >> > be, but there is no requirement that I know of.
> >>
> >> correct, the (mainline-)kernel runs just fine on both the vendor-fork of
> > uboot
> >> as well as on mainline.
> >>
> >>
> >> > Does mainline run on your board?
> >> >
> >> > >  - The device tree seems to be in two places, once via:
> >> > >         resource_tool --image=resource2.img --pack linux/logo.bmp
> >> > >         ${DTS}.dtb
> >> > >
> >> > >   that gets put into the resource file and then again at the end
of the
> >> > >
> >> > > kernel via CONFIG_ARM_APPENDED_DTB.  Do I need both?  When I do both
> >> > > I get things like:
> >> >
> >> > > Unknow param: MACHINE_MODEL:rk30sdk!
> >> > > Unknow param: MACHINE_ID:007!
> >>
> >> ARM_APPEND_DTB is meant for boards where the bootloader cannot load the
> >> devicetree (to old or so) and also cannot be reasonably exchanged. So
the
> >> append-mechanism was invented to allow bundling the devicetree with the
> > actual
> >> kernel image, so that to the bootloader it looks like just any other
kernel
> >> image.
> >>
> >> So you essentially only need one or the other. Also at least mainline
uboot
> >> also supports the FIT image type, where you can bundle the devicetree
in a
> >> more generalized way.
> >>
> >> For your message I would guess the kernel didn't find a usable
devicetree
> >> somehow and was falling back to ATAGS-based board selection?
> >>
> >>
> >
> >
> >