On 8/7/20 12:58 PM, Wolfgang Grandegger wrote: > Am 06.08.20 um 14:50 schrieb Marek Vasut: >> On 8/6/20 2:36 PM, Wolfgang Grandegger wrote: >>> Am 06.08.20 um 13:04 schrieb Marek Vasut: >>>> On 8/6/20 12:53 PM, Wolfgang Grandegger wrote: >>>>> This reverts commit c5f4b805755912a3d2fe20f014b6b6ab0473bd73. >>>>> >>>>> Conflicts: >>>>> arch/arm/mach-socfpga/misc_gen5.c >>>>> >>>>> Without socfpga_sdram_apply_static_cfg(), the system hangs when Linux >>>>> calls altvipfb2_start_hw() of the Intel Video and Image Processing(VIP) >>>>> Frame Buffer II driver (drivers/video/fbdev/altvipfb2.c) >>>> >>>> There is no such driver in mainline U-Boot or Linux. >>> >>> It's a simple frame buffer driver from linux-socfpga for the IP core >>> Intel Video and Image Processing(VIP) Frame Buffer II. It actually >>> hangs here when the streaming starts: >>> >>> https://github.com/altera-opensource/linux-socfpga/blob/socfpga-5.4.44-lts/drivers/video/fbdev/altvipfb2.c#L69 >>> >>> I can also hang the system if I setup and start the FB with just a >>> few U-Boot commands. I think the system hangs when the IP core starts >>> reading the FB data from the system memory. >> >> I am CCing Dinh , I recall there was some discussion about hangs on >> CycloneV and it was fixed recently. >> >>>>> , but only >>>>> after a power cycle (cold boot). The issue does not show up after a >>>>> soft reset (warm boot) and with v2018.11. >>>> >>>> See the commit message of the patch this is reverting, I believe there >>>> is a deeper issue with the static config register. Can you investigate? >>> >>> I read the commit message, but well, I can't follow all the details :(. >>> On the other hand, it seems also not clear why the fix was added. Any >>> idea what to investigate. >> >> The system was repeatedly rebooted in a loop, the FPGA was loaded before >> Linux booted. After hundreds of reboots, the system got stuck on setting >> up the static cfg register. I think there was even another email > > I rebooted Linux on my MCVEVP more than 100 times with and without > loading the FPGA in U-Boot. The system never hang!
It could very well be bitstream related, wait for Simon to chime in. Do you load the bitstream in U-Boot or in Linux ? >> exchange where the suggestion was to make this apply_static_cfg optional >> and only use it when the DRAM port is enabled in the quartus design. >> Maybe that is the way out of this ? > > Yep. [...]
