Hi Fabio, On 08/28/2016 07:47 PM, Fabio Estevam wrote: > On Sun, Aug 28, 2016 at 6:04 PM, Eric Nelson <e...@nelint.com> wrote: >> On 08/28/2016 01:59 PM, Eric Nelson wrote: >>> Hi Fabio, Peng, and all. >>> >>> I just ran into a problem with bus frequency switching >>> on the EVK and there appears to be a U-Boot component. >>> >>> Using the 4.1.15 kernel from git.freescale.com (commit a4d2a08) >>> and the latest U-Boot from Stefano's imx tree (commit a3e5519) >>> causes the EVK to hang during a bus frequency switch to LOW_POWER >>> mode. >>> >>> The last gasp is this: >>> Bus freq set to 24000000 start... >>> >>> <snip> >>> >>> Has anybody else experienced this? >>> >> <snip> > > I was able to reproduce this problem here. > > The major difference between mainline U-Boot and NXP U-Boot is that > mainline U-Boot uses SPL and NXP U-Boot uses imximage.cfg to configure > the DDR. >
Right, and unfortunately, walking the differences can be time consuming. > I have just created and tested the patch below against Stefano's tree: > http://pastebin.com/crAe1Yr1 > > , which basically uses imximage.cfg from NXP U-Boot instead of SPL and > the hang does not occur. > Cool. That narrows things down a lot. > It seems to me that we need to carefully review the SPL DDR init code > in mainline in order to fix this problem. > Or clock tree. > I will try to take a look at it tomorrow, but if anyone spots the DDR > problem in the SPL code, then feel free to submit the patch :-) > Will do. Regards, Eric _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
