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a22311e6a6
openwrt/target/linux/imx6
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Koen Vandeputte 74738c4b80 imx6: fix DMA transaction errors 
Following errors were seen in the past on imx6 when using serial:

[ 22.617622] imx-uart 2020000.serial: DMA transaction error.
[ 22.623228] imx-uart 2020000.serial: DMA transaction error.
[ 22.628826] imx-uart 2020000.serial: DMA transaction error.
[ 22.648951] imx-uart 2020000.serial: DMA transaction error.
[ 22.654558] imx-uart 2020000.serial: DMA transaction error.
[ 22.660156] imx-uart 2020000.serial: DMA transaction error.

Which is the reason why DMA for the serial ports
got disabled in commits:

efb362cd93 ("imx6: disable dma on uart")
3b4241071d ("imx6: disable UART dma")

As indicated on mailinglist discussion, the cause seems to be
the usage of very old SDMA firmware which is present in the soc:

[    0.624302] imx-sdma 20ec000.sdma: Direct firmware load for imx/sdma/sdma-imx6q.bin failed with error -2
[    0.624318] imx-sdma 20ec000.sdma: Falling back to user helper
[   64.531607] imx-sdma 20ec000.sdma: external firmware not found, using ROM firmware

This patch adds the new firmware binary. (2196 bytes)

It is required to embed the binary into the kernel image, as it
gets loaded very early in the boot process where the rootfs is not
available yet:

[    0.622966] imx-sdma 20ec000.sdma: loaded firmware 3.3

Extended testing shows that the DMA errors are not seen anymore
when using this newer firmware version.

Signed-off-by: Koen Vandeputte <koen.vandeputte@ncentric.com>
2018-11-06 11:49:27 +01:00
..
base-files imx6: Initial support for SolidRun CuBox-i devices based on i.MX6 processors (i1, i2, i2eX, and i4Pro). 2018-08-25 15:40:23 +02:00
files/firmware/imx/sdma imx6: fix DMA transaction errors 2018-11-06 11:49:27 +01:00
image imx6: use BUILD_DEVICES in uboot-imx6 for mx6cuboxi 2018-09-05 10:00:01 +02:00
patches-4.14 imx6: fix DMA transaction errors 2018-11-06 11:49:27 +01:00
profiles imx6: rename Generic profile to Default, fixes u-boot image build issue 2018-09-05 10:00:01 +02:00
config-4.14 imx6: fix DMA transaction errors 2018-11-06 11:49:27 +01:00
Makefile imx6: extend cubox support to hummingboard, add support for building full images 2018-09-03 12:06:24 +02:00