Messages in this thread | | | Date | Fri, 17 Apr 2015 18:18:39 +0900 | From | jiwang <> | Subject | Re: [PATCH v1 11/15] serial: imx: initialized DMA w/o HW flow enabled |
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Hello Sebastian
On 04/13/2015 05:06 PM, Sebastian Andrzej Siewior wrote: > On Mon, Apr 13, 2015 at 04:40:15PM +0900, jiwang wrote: >> Hi Sebastian > Hi Jiada, > >>> My question is how was this tested. Before your patch none of my boards >>> were using DMA because RTS/CTS is not in use and this was a key >>> requirement. Now SDMA goes crazy. Is there a SDMA firmware required for >>> this to work? >> We tested the patch set with our modified kernel tree, >> and I find upstream kernel is not building SDMA firmware, >> I will submit another patch to add it. > Please make sure it is tagged stable. There is no hint that this is required > and as of it now, it breaks v4.0. Due to missing of SDMA firmware, uart sdma mode is broken, but it is uncovered by this commit on your environment.
> One question, where do you have the firmware from? I picked the one from FSL's > v3.10 SDK and I ended up with FIFO-overflows so it was clearly the wrong one > (and the built-in SDMA firmware does not work as expected as you mentioned). I got sdma firmware from FSL kernel tree. > Is this firmware only required the imx6 series or also for older versions like > imx5? the firmware only supports imx6 series, AFAIK, I checked with Freescale imx6 support team, due to licensing issue, I am not entitled to upstream FSL SDMA firmware. so seems currently disable SDMA support for uart is our only option at the moment.
Thanks, Jiada >> Thanks, >> Jiada > Sebastian
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