[U-Boot] ROCK64 fails to boot using U-Boot TPL

[Matwey V. Kornilov <matwey.kornilov@gmail.com>]

24.09.2019 20:54, Simon South пишет:
> On 2019-09-24 12:54 p.m., Matwey V. Kornilov wrote:
>> Simon, maybe you'll describe a way to obtain SD card image which you
>> use? For the case if anybody wants to reproduce the issue in situ?
> 
> Sure---I'd love for other people to test this, and it's pretty easy
> since it doesn't require anything other than U-Boot itself.
> 
> Assuming the CROSS_COMPILE and BL31 environment variables are set up
> appropriately (I'm using ATF 2.1 from the mainline repository):
> 
> 1. Switch to U-Boot's master branch and/or configure the source tree
> identically to my own with
> 
>      git checkout a9fa70b7b7167487affc5d919e541872c99e814b
> 
> 2. Apply the attached patch, which enables the "mtest" command, with
> 
>      patch -p1 < rock64-enable-mtest.patch
> 
> 3. Build U-Boot as usual:
> 
>      make distclean; rm -f ./idbloader.img
>      make rock64-rk3328_defconfig all u-boot.itb
> 
> 4. Write U-Boot to a microSD card as usual:
> 
>      sudo dd if=idbloader.img of=/dev/mmcblk0 seek=64
>      sudo dd if=u-boot.itb of=/dev/mmcblk0 seek=16384
> 
> 5. Place the microSD card in the ROCK64 and start it. Once the SPL
> loads, hit the spacebar to enter the shell and start the memory test with
> 
>      mtest
> 
> On my ROCK64, this immediately begins throwing off errors like
> 
>   FAILURE (read/write) @ 0x020014c0: expected 0x00000299, actual
> 0x00000219)
> 
> and if I continue the boot process with "boot", the NetBSD kernel will
> load but panic almost immediately.

How do you take NetBSD image?

> 
> Note mine is a ROCK64 v2.0 with a 32Gb SpecTek LPDDR3 memory
> module---there is also a ROCK64 v3.0 and some variance in the memory
> chips used, so it could be this is limited to a specific model or
> production run.
> 
> Now here's what I've discovered lately:
> 
> Everything works normally if I have U-Boot TPL's set a slightly lower
> clock rate for the memory, by editing
> arch/arm/dts/rk3328-sdram-lpddr3-1600.dtsi and changing the "800" on
> line 27 to "766".
> 
> That suggests a hardware issue with my ROCK64, and in fact others have
> reported similar problems with the 2.0 version [1]. I'd be willing to
> leave it at that, except that if I also patch the (333MHz) Rockchip TPL
> to set a _higher_ clock rate for the memory, it continues to work just
> fine---all the way up to 933MHz!
> 
> So this is not just a hardware problem; there is some incompatibility
> between the RK3328 SDRAM driver as it exists in U-Boot and at least one
> group of ROCK64s in the world.
> 
> At the moment I'm still trying to identify what's different in the
> closed-source loader that causes it not to have this issue. Anyone have
> any thoughts?
> 
> [1] https://forum.pine64.org/showthread.php?tid=7387
> 
> 
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