Raspberry pi have two built-in UARTs, PL011 and mini UART
by default: /dev/ttyS0 refers to the mini UART, /dev/ttyAMA0 refers to
the PL011
https://www.raspberrypi.org/documentation/configuration/uart.md
So I think the brcm43438 service should use the /dev/ttyAMA0.
On 2018年03月20日 10:41, Dengke Du wrote:
For rpi0-w bluetooth, before the commit:
https://github.com/agherzan/meta-raspberrypi/commit/6235b0a8543bcf6704d0fe0156ab2b847a4ea0bc#diff-70e4910388c3702c52118d7acf7556e7
the brcm43438.service always failed, because it depends on
/dev/ttyAMA0,after that commit, the 'udev-rules-rpi' added to the
RDEPENDS for rpi0-w,we
can check it here:
https://github.com/agherzan/meta-raspberrypi/commit/6235b0a8543bcf6704d0fe0156ab2b847a4ea0bc#diff-3b2568c620828b0ba653c1070041318aR52
for service brcm43438, but I still use the /dev/ttyAMA0 in it, not
/dev/serial1(when I use /dev/serial1, the service failed), the service
can start everytime correctly.
On 2018年03月19日 02:10, r10kindsofpeople wrote:
Update: I suspect this is not the proper way to do this, but in case
it provides useful information toward a better solution...
1) systemctl disable brcm43438.service
2) modified 99-com.rules to include TAG+="systemd" and
ENV{SYSTEMD_WANTS}="device-brcm43438.service"
3) cp /lib/systemd/system/brcm43438.service
/etc/systemd/system/device-brcm43438.service
4) modified device-brcm43438.service to be as follows:
[Unit]
Description=Broadcom BCM43438 bluetooth HCI
[Service]
Type=simple
ExecStart=/usr/bin/hciattach -n /dev/serial1 bcm43xx 921600 noflow -
Restart=on-failure
note removal of Before, After, ConditionPath, Install sections and
addition of Restart=on-failure. This last was to cope with an
intermittent timeout in hciattach. Suppose I should have tried
increasing the timeout first.
This seems to have gotten me to the point of it starting up at least
10 times successfully. Bottom line, in my opinion, is that
brcm43438.service is somehow running before the udev script can
create the symbolic link for /dev/serial1 -> /dev/ttyAMA0 despite the
"After=dev-serial1.device" clause.
John
On Sat, Mar 17, 2018 at 12:32 PM r10kindsofpeople
<r10kindsofpeo...@gmail.com <mailto:r10kindsofpeo...@gmail.com>> wrote:
Background: I'm trying to bring up the pi zero w's bluetooth
using systemd. Started with rocko and then moved to 'master' of
meta-raspberry pi, sync'd about a week ago after noticing that
there were some recent updates in this area.
There was an initial problem with /dev/serial1 not showing up...I
found udev-rules-rpi.bb <http://udev-rules-rpi.bb>, added it to
my layer, and when it still didn't show up in my rootfs, I punted
and installed it in /etc/udev/rules.d by hand and now
/dev/serial1 shows up. Given time, I can probably fix the recipe
on my own, so moving on.
But brcm43438.service still fails on boot. Despite having
"After=dev-serial1.device" in the service Unit section, it fails
with:
Mar 17 16:21:13 raspberrypi0-wifi systemd[1]: Started Broadcom
BCM43438 bluetooth HCI.
Mar 17 16:21:14 raspberrypi0-wifi hciattach[105]: Can't open
serial port: No such file or directory
Mar 17 16:21:14 raspberrypi0-wifi hciattach[105]: Can't
initialize device: No such file or directory
Mar 17 16:21:14 raspberrypi0-wifi systemd[1]:
[[0;1;39mbrcm43438.service: Main process exited, code=exited,
status=1/FAILURE[[0m
Mar 17 16:21:14 raspberrypi0-wifi systemd[1]:
[[0;1;39mbrcm43438.service: Unit entered failed state.[[0m
Mar 17 16:21:14 raspberrypi0-wifi systemd[1]:
[[0;1;39mbrcm43438.service: Failed with result 'exit-code'.[[0m
If, after booting and ssh'ing into pi, I restart the service, it
starts successfully.
Any hints about what I might change to get the brcm43438.service
to start correctly the first time (every time)?
John
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