[U-Boot] [PATCH 0/2] Fix memory instability on ROCK64

[Kurt Miller <lists@intricatesoftware.com>]

On Sun, 2019-10-06 at 12:28 -0400, Simon South wrote:
> These two patches fix small issues with the Rockchip RK3328 SDRAM
> driver that prevented my PINE64 ROCK64 from booting and running
> normally using U-Boot's TPL [1].
> 
> The first patch updates the phy_dll_bypass_set() function to use the
> correct units for its DDR-frequency parameter, which is already
> specified in MHz and does not need converting. This issue caused the
> DRAM controller to be misconfigured for all but the lowest memory
> speeds.
> 
> The second patch fixes an apparent typo in phy_cfg() that caused the
> DRAM controller's deskew registers to be loaded with incorrect values:
> Instead of copying from the second 44-element portion of the
> skew-value array the driver instead re-used a portion of the first.
> This also produced instability.
> 
> With both these patches applied my ROCK64 boots and runs normally
> using the U-Boot TPL and a memory frequency of either 800 or 933 MHz:
> In both cases the "mtest" memory-test command runs indefinitely
> without error, and I can boot into NetBSD successfully without the
> kernel hanging or panicking.
> 
> [1] https://lists.denx.de/pipermail/u-boot/2019-September/384076.html
> 
> Simon South (2):
>   ram: rk3328: Use correct frequency units in function
>   ram: rk3328: Fix loading of skew values
> 
>  drivers/ram/rockchip/sdram_rk3328.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 

Your corrections also have helped OpenBSD/arm64 boot using
u-boot TPL on Rock64. Here is one test report result:

https://marc.info/?l=openbsd-arm&m=157041723301520&w=2

Thank you for tracking down the problems.

-Kurt