Re: serial driver for imx28

[Julien Blanc via Xenomai]

Le vendredi 21 juin 2019 à 14:14 +0200, Wolfgang Denk a écrit :
> Dear Julien,
> 
> The i.MX28 is a special beast.
> 
> Your issue is most likely caused by a somewhat stup^H^H^H^Hsimple
> implementation of the UART driver. When it receives the interrupt
> after receiving a block of data, it stops DMA until the data has
> been read from the RX buffer and pushed to the TTY layer.  Given the
> tiny size of the UART RX FIFO, this will cause frequent overruns if
> you don't enable or cannot use flow control.

Indeed.

The driver seems to be really buggy outside the simple use cases
(anything involving reconfiguring the transmission settings on the fly
is not recommended), but RTS/CTS definitely solved our data loss
issues. As a bonus we were even able to increase the baudrate up to
460800 bauds.

Best regards and thanks all for your answers,

Julien

RE: Commands for reading, loading and unloading drivers on BeagleBone Black?

[Lange Norbert via Xenomai]

Hello,

your question was rather vague. The echos I wrote (un)bind drivers to single 
devices, which only needs the linux kernel.

You apparently use Busybox, in case you have the “modprobe” tool, this is 
easier to use that instead of insmod and rmmod.
In case you use (e)udev you probably don’t have to do a thing, and the modules 
get loaded automatically.

Norbert

From: danwe 
Sent: Freitag, 21. Juni 2019 13:23
To: Lange Norbert ; xenomai@xenomai.org
Subject: Re: Commands for reading, loading and unloading drivers on BeagleBone 
Black?


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CAUTION WITH E-MAIL CONTENT AND ANY LINKS OR ATTACHMENTS.
Hi,
what exactly are you doing with those "echos" you wrote? I mean why should I 
let linux pick a driver for a device? I have Xenomai with RTnet. I would like 
to use Xenomai- / RTnet-drivers for that.
I have found the following commands: lsmod, insmod, rmmode. See the following 
output.
# lsmod
Module  Size  Used byTainted: G
rtipv4 18699  0
rtpacket4179  0
rt_ticpsw  26115  0
rt_davinci_mdio 4570  0
rt_smsc 2165  0
rtnet  28479  3 rtipv4,rtpacket,rt_ticpsw
omap_rng4174  0
# iinsmod
-sh: iinsmod: not found
# lsmod
Module  Size  Used byTainted: G
rtipv4 18699  0
rtpacket4179  0
rt_ticpsw  26115  0
rt_davinci_mdio 4570  0
rt_smsc 2165  0
rtnet  28479  3 rtipv4,rtpacket,rt_ticpsw
omap_rng4174  0
# insmod
BusyBox v1.22.1 (2019-03-16 12:39:06 CET) multi-call binary.

Usage: insmod FILE [SYMBOL=VALUE]...

Load the specified kernel modules into the kernel

# rmmod
BusyBox v1.22.1 (2019-03-16 12:39:06 CET) multi-call binary.

Usage: rmmod [-wfa] [MODULE]...

Unload kernel modules

-w  Wait until the module is no longer used
-f  Force unload
-a  Remove all unused modules (recursively)

Are these modules correct?

Regards,

Daniel

Am Mi., 19. Juni 2019 um 17:41 Uhr schrieb Lange Norbert 
mailto:norbert.la...@andritz.com>>:
Use sysfs-

# unbind the current driver for those devices
for sio in 1-2:1.0  1-2:1.1  1-2:1.2  1-2:1.3; do
echo "$sio" > /sys/bus/usb/devices/"$sio"/driver/unbind
done

# use a specific driver 'ftdi_sio' for a device
echo "1-2:1.0" > /sys/bus/usb/drivers/ftdi_sio/bind
# let linux pick a driver for a device
echo '1-2:1.0' >  /sys/bus/usb/drivers_probe

works similar with other busses.

regards, Norbert Lange

> -Original Message-
> From: Xenomai 
> mailto:xenomai-boun...@xenomai.org>> On Behalf 
> Of danwe via
> Xenomai
> Sent: Mittwoch, 19. Juni 2019 10:19
> To: xenomai@xenomai.org
> Subject: Commands for reading, loading and unloading drivers on
> BeagleBone Black?
>
> E-MAIL FROM A NON-ANDRITZ SOURCE: AS A SECURITY MEASURE, PLEASE
> EXERCISE CAUTION WITH E-MAIL CONTENT AND ANY LINKS OR
> ATTACHMENTS.
>
>
> Hello,
>
> I am using a BeagleBone Black with Xenomai and RTnet on top. As some real-
> time programs are not working it could be that the installed drivers on my
> BeagleBone Black are still the standard drivers and not the real-time drivers.
>
> As I did not find anything on internet (only how to install drivers for 
> Windows
> when using BeagleBone Black) I would like to ask you if anyobdy knows
> commands for BeagleBone Black to read, load and unload installed drivers on
> BBB?
>
> Regards
>
> Daniel


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