On 2/24/19 9:58 PM, Peter Chen wrote:
I suspect the controller is stuck at high speed. Chandler, would you please supply below information: - If there is SOFs on the bus (you need to measure by probe) when the issue occurs? - If the SOF can't be observed at bus, it means the disconnection can't be observed either. You could check the portsc.ccs bit if you could disconnect the HUB by some ways. No software workaround now, we still don't know the root cause. Would you please dump below registers at usbphy when the issue occurs: for (write USBPHY.USBPHYx_DEBUG1n($USBPHY + 0x70) from 1 to 7) read USBPHY.USBPHYx_DEBUG0_STATUS three times, and delay 10ms between each read Record the above 6 values, and tell me, thanks. Peter
Hi Peter, I don't currently have access to a probe; is there any you could recommend? Here is what's in the debugfs registers after failure, including PORTSC: USBINTR reg: 00000037 USBSTS reg: 000ce088 USBMODE reg: 00000013 USBCMD reg: 00010075 PORTSC reg: 18001a05 By disconnecting the hub do you mean the root hub on the SBC? I might have to look through the schematic to find a way to reset it electronically. Here is the result of writing values 1 through 7 to DEBUG1 and reading DEBUG0 (with 10ms delay). I hope this is what you want; I had trouble finding documentation on those registers: 1 write 0x00000001 to 0x020CA070 Value at address 0x20CA060 (0xb6f76060): 0x7B2C Value at address 0x20CA060 (0xb6f4a060): 0x7B2C Value at address 0x20CA060 (0xb6fa9060): 0x7B2C 2 write 0x00000002 to 0x020CA070 Value at address 0x20CA060 (0xb6f12060): 0x64 Value at address 0x20CA060 (0xb6f8e060): 0x64 Value at address 0x20CA060 (0xb6fed060): 0x64 3 write 0x00000003 to 0x020CA070 Value at address 0x20CA060 (0xb6f77060): 0x10840108 Value at address 0x20CA060 (0xb6f2f060): 0x10820108 Value at address 0x20CA060 (0xb6f9c060): 0x10804104 4 write 0x00000004 to 0x020CA070 Value at address 0x20CA060 (0xb6fdf060): 0x10001 Value at address 0x20CA060 (0xb6f47060): 0x10001 Value at address 0x20CA060 (0xb6fb2060): 0x10001 5 write 0x00000005 to 0x020CA070 Value at address 0x20CA060 (0xb6f56060): 0x1011101 Value at address 0x20CA060 (0xb6fc2060): 0x1011101 Value at address 0x20CA060 (0xb6f72060): 0x1011101 6 write 0x00000006 to 0x020CA070 Value at address 0x20CA060 (0xb6f31060): 0x101 Value at address 0x20CA060 (0xb6f7a060): 0x101 Value at address 0x20CA060 (0xb6fc8060): 0x101 7 write 0x00000007 to 0x020CA070 Value at address 0x20CA060 (0xb6fe3060): 0x5300010 Value at address 0x20CA060 (0xb6ffa060): 0x5300010 Value at address 0x20CA060 (0xb6f04060): 0x5300010 Chandler
