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Issue with OMAP UART driver(s), request for information
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alexey...@gmail.com
Nov 12, 2012, 1:18:56 PM11/12/12
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Hello everyone,
I'm developing software for product based on LogicPD DM3730 Wireless Torpedo SoM using 3.0 kernel and I've hit into a problem that on high speeds (>1Mbaud) there is a gap in data transmit with duration of 25us (I've tested this using oscilloscope). This is probably fault of driver or driver-related stuff, since on 2.6.32 where UART was served by 8250 driver there was no such issues. Details of issue are: Every FIFO size during Tx there is a 25us gap. Tuning threshold on Tx changes only size of data between gaps but does not effect gap itself anyhow.
Bottom-line questions are:
Is there a chance to figure out probable location of this issue in code?
Was similar issue fixed already in more recent versions of Linux Kernel?
Thanks in advance for any information that may help.
Best regards,
Alexey Pelykh
I'm developing software for product based on LogicPD DM3730 Wireless Torpedo SoM using 3.0 kernel and I've hit into a problem that on high speeds (>1Mbaud) there is a gap in data transmit with duration of 25us (I've tested this using oscilloscope). This is probably fault of driver or driver-related stuff, since on 2.6.32 where UART was served by 8250 driver there was no such issues. Details of issue are: Every FIFO size during Tx there is a 25us gap. Tuning threshold on Tx changes only size of data between gaps but does not effect gap itself anyhow.
Bottom-line questions are:
Is there a chance to figure out probable location of this issue in code?
Was similar issue fixed already in more recent versions of Linux Kernel?
Thanks in advance for any information that may help.
Best regards,
Alexey Pelykh
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