On Tue, 2022-02-08 at 11:02 +0100, Marek Vasut wrote: > On 2/8/22 03:41, Liu Ying wrote: > > Hello everyone, > > > > > > There are many blank areas which are undocumented, this LCDIF > > > > > CRC32 > > > > > feature, i.MX8M Mini Arteris NOC at 0x32700000 , the ARM GPV > > > > > NIC- > > > > > 301 > > > > > at > > > > > 0x32{0,1,2,3,4,5,6,8}00000 and their master/slave port > > > > > mapping. > > > > > The > > > > > NOC > > > > > and NICs were documented at least up to i.MX6QP and then that > > > > > information disappeared from NXP datasheets. I think > > > > > reconfiguring > > > > > the > > > > > NOC/NIC QoS would help mitigate this shift issue described > > > > > below > > > > > (*). > > > > > > > > I also think the QoS would help if it is configureable. > > > > > > It is programmable, it's just the port mapping which is > > > undocumented. > > > > > > > > Do you know if there is some additional NOC/NIC documentation > > > > > for > > > > > i.MX8M > > > > > Mini available ? > > > > > > > > No. > > > > > > Can you ask someone internally in NXP maybe ? > > > > Maybe, you may try community.nxp.com, like the i.MXRT case. > > The community.nxp.com is unhelpful, the i.MXRT case it a good example > -- > the solution to the problem has been found by the person who asked > the > question on their own, and elsewhere too. AFAIK, there are questions answered by internal support team and RnD team at that community. I personally take it as a resource to use. > > But note that the i.MXRT interconnect documentation is available in > the > i.MXRT datasheet, which made that possible in the first place. On > i.MX, > all that information has been removed from the datasheet in i.MX7 > and > i.MX8M, so I cannot even help myself, even if I wanted to. This is > very bad. I'm not familiar with the documention in that area, so I personally will not be helpful at the documention topic. The main purpose I jumped in this thread is to review the patch and share the idea to use the existing drm debugfs crc support instead of creating a sysfs attribute. Liu Ying