Re: [U-Boot] mx6ul_14x14_evk
Hi Eric, On Mon, Aug 29, 2016 at 10:27 AM, Eric Nelson wrote: >> 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. It seems I don't get the hang anymore. Will submit a patch series in the afternoon. Regards, Fabio Estevam ___ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
Re: [U-Boot] mx6ul_14x14_evk
Hi Fabio, On 08/28/2016 07:47 PM, Fabio Estevam wrote: > On Sun, Aug 28, 2016 at 6:04 PM, Eric Nelson 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 2400 start... >>> >>> >>> >>> Has anybody else experienced this? >>> >> > > 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
Re: [U-Boot] mx6ul_14x14_evk
Hi Eric, On Sun, Aug 28, 2016 at 11:47 PM, Fabio Estevam wrote: > 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. > > 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. > > It seems to me that we need to carefully review the SPL DDR init code > in mainline in order to fix this problem. > > 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 :-) I managed to fix the SPL DDR and now I don't see the hang. Will send a formal patch. ___ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
Re: [U-Boot] mx6ul_14x14_evk
Hi Eric, On Sun, Aug 28, 2016 at 6:04 PM, Eric Nelson 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 2400 start... >> >> And the code block in question is here: >> >> http://git.freescale.com/git/cgit.cgi/imx/linux-2.6-imx.git/tree/arch/arm/mach-imx/busfreq_ddr3.c?h=imx_4.1.15_1.0.0_ga#n386 >> >> When using the binary U-Boot 2015.07 from the EVK package (commit >> d7d7c43 from git.freescale.com), the kernel gets through the >> frequency switch and produces this message. >> >> Bus freq set to 2400 done! >> >> I first saw this problem with u-boot-fslc branch v2016.07 >> and linux-fslc (4.1.29 and 4.1.30). >> >> Has anybody else experienced this? >> > > I forgot to mention it, but this is easy to reproduce > by downing both ethernet interfaces and blanking the > display. > > ifconfig eth0 down > ifconfig eth1 down > echo 1 > /sys/class/graphics/fb0/blank 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. 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. It seems to me that we need to carefully review the SPL DDR init code in mainline in order to fix this problem. 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 :-) Thanks, Fabio Estevam ___ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
Re: [U-Boot] mx6ul_14x14_evk
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 2400 start... > > And the code block in question is here: > > http://git.freescale.com/git/cgit.cgi/imx/linux-2.6-imx.git/tree/arch/arm/mach-imx/busfreq_ddr3.c?h=imx_4.1.15_1.0.0_ga#n386 > > When using the binary U-Boot 2015.07 from the EVK package (commit > d7d7c43 from git.freescale.com), the kernel gets through the > frequency switch and produces this message. > > Bus freq set to 2400 done! > > I first saw this problem with u-boot-fslc branch v2016.07 > and linux-fslc (4.1.29 and 4.1.30). > > Has anybody else experienced this? > I forgot to mention it, but this is easy to reproduce by downing both ethernet interfaces and blanking the display. ifconfig eth0 down ifconfig eth1 down echo 1 > /sys/class/graphics/fb0/blank Regards, Eric ___ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
[U-Boot] mx6ul_14x14_evk
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 2400 start... And the code block in question is here: http://git.freescale.com/git/cgit.cgi/imx/linux-2.6-imx.git/tree/arch/arm/mach-imx/busfreq_ddr3.c?h=imx_4.1.15_1.0.0_ga#n386 When using the binary U-Boot 2015.07 from the EVK package (commit d7d7c43 from git.freescale.com), the kernel gets through the frequency switch and produces this message. Bus freq set to 2400 done! I first saw this problem with u-boot-fslc branch v2016.07 and linux-fslc (4.1.29 and 4.1.30). Has anybody else experienced this? Please advise, Eric ___ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
