Hello, sorry for referring old mail. I found the reason of character flood of Allwinner H6, the symptom of following message.
>> Does it accept input at that point? > >Yes, simply press Enter, message flood has occured like this: > >bootfile: sd0a:/bsd >boot device: lookup sd0a:/bsd failed >root device: <-- press enter here >ohci1: 1193 scheduling overruns >use one of: exit >root device: >use one of: exit >root device: >use one of: exit >root device: >use one of: exit >root device: >use one of: exit >root device: >use one of: exit >root device: >use one of: exit >root device: >use one of: exit >root device: >use one of: exit >root device: >use one of: exit >root device: >use one of: exit >root device: >use one of: exit >root device: >use one of: exit >root device: >use one of: exit >root device: >use one of: exit >root device: >use one of: exit >root device: >use one of: exit >root device: >use one of: exit >root device: >use one of: exit >root device: >use one of: exit >root device: >use one of: exit >root device: > >and this flood can stop by pressing Ctrl-C. >simply hit a key, it looks many times pressed. > >use one of: exit >root device: >aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa This is caused by disabling FIFO of Allwinner H6. Allwinner H2+ (and maybe H5) has 64bytes FIFO. But H6's one has 256bytes, we have to treat it uses different UART. We can test the difference of behavior. Simply boot U-boot and write 6 (reset Tx/Rx FIFO and disable FIFO) or 0 (simply disable FIFO) to UART's FCR register. * U-boot enables UART FIFO as default. There is no problem on H2+ but same flood occurs on H6. I haven't found the method how to disable FIFO without any problem. Does anyone have good idea? Regards, -- SASANO Takayoshi (JG1UAA) <u...@mx5.nisiq.net>
