Opps, missed your kernel version....
I can verify 3.8 is working, happily seeing the PPS signal from a GPS
module.
Mike
On 02/27/2014 04:00 PM, [email protected] wrote:
Interesting. My further investigations led me to the omap-serial
driver, which sets Auto-CTS for the port only when a certain flag is
set, and it appears to be never set, even with the latest version of
the driver (I'm running kernel 3.12). I had to patch the driver to
force that flag. Maybe I should go back and look at the 3.8 version to
see if it's something that worked back then but then broke in the
process of upgrading.
On Thursday, February 27, 2014 10:55:12 AM UTC-8, Mike Bell wrote:
On Monday, February 24, 2014 1:53:56 PM UTC-5, [email protected] wrote:
Is there anyone out there who has actually gotten UART4
working correctly with hardware flow control? I have HDMI
disabled, the proper pins muxed, the latest omap-serial driver
from Linux 3.12 seems to set the TI chip's registers
correctly. But no matter what I do, UART4 transmit totally
ignores CTS. sending whether it's asserted or not. Google
finds lots of hits complaining about the issue, and lots of
suggestions about what might be wrong, but nothing that
definitively says whether or not this can be made to work.
So the question is simple: has anyone ever gotten this to
work, or is the TI chip fundamentally flawed?
Yes, I'm using UART4 CTS P8-35, also UART4 rx/tx
root@arm-ticktock:/sys/devices/bone_capemgr.9# uname -a
Linux arm-ticktock 3.8.13-bone40.1 #1 SMP Thu Feb 20 21:12:57 EST
2014 armv7l GNU/Linux
root@arm-ticktock:/sys/devices/bone_capemgr.9# cat slots
0: 54:PF---
1: 55:PF---
2: 56:PF---
3: 57:PF---
4: ff:P-O-L Bone-LT-eMMC-2G,00A0,Texas Instrument,BB-BONE-EMMC-2G
5: ff:P-O-- Bone-Black-HDMI,00A0,Texas Instrument,BB-BONELT-HDMI
6: ff:P-O-- Bone-Black-HDMIN,00A0,Texas Instrument,BB-BONELT-HDMIN
7: ff:P-O-L Override Board Name,00A0,Override Manuf,BB-UART4
8: ff:P-O-L Override Board Name,00A0,Override Manuf,BB-UART4-RTSCTS
root@arm-ticktock:/sys/devices/bone_capemgr.9# ls -l
/lib/firmware/BB-UART4*
-rw-r--r-- 1 root root 861 Feb 21 02:14
/lib/firmware/BB-UART4-00A0.dtbo
-rw-r--r-- 1 root root 936 Feb 21 02:14
/lib/firmware/BB-UART4-RTSCTS-00A0.dtbo
root@arm-ticktock:/sys/devices/bone_capemgr.9# grep optarg
/boot/uboot/uEnv.txt
#optargs=capemgr.disable_partno=BB-BONELT-HDMI,BB-BONELT-HDMIN,BB-BONE-EMMC-2G
optargs=quiet init=/lib/systemd/systemd
capemgr.disable_partno=BB-BONELT-HDMI,BB-BONELT-HDMIN
capemgr.enable_partno=BB-UART4,BB-UART4-RTSCT
root@arm-ticktock:/sys/devices/bone_capemgr.9#
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