Enable serial console on Raspberry Pi 3
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The fix has been merged in master.
Best regards,
Leon
I have provided a fix that sets KERNEL_IMAGETYPE to Image in change 9727.
Best regards, Leon
Hi,
Thanks to the help and the hints provided by @Jan-Simon Moeller and @Scott Murray during AGL weekly dev call my further investigations found out that the problem is cause by wrong value of KERNEL_IMAGETYPE. For Raspberry Pi kernel7.img contains not only the kernel but also the bootloader. For booting successfully regular AGL images, aka without agl-sota, KERNEL_IMAGETYPE should be set to Image (not uImage). For quick and dirty tests I added the following line to local.conf:
KERNEL_IMAGETYPE="Image"With this change the image boots and there is output on the serial console:
Automotive Grade Linux 3.99.1+snapshot-20170613 raspberrypi3 ttyS0
raspberrypi3 login: [ 15.368031] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[ 15.375579] smsc95xx 1-1.1:1.0 eth0: link up, 100Mbps, full-duplex, lpa 0xCDE1
[ 15.400162] 8021q: 802.1Q VLAN Support v1.8
[ 17.721592] Bluetooth: HCI UART driver ver 2.3
[ 17.726217] Bluetooth: HCI UART protocol H4 registered
[ 17.731444] Bluetooth: HCI UART protocol Three-wire (H5) registered
[ 17.741452] Bluetooth: HCI UART protocol BCM registered
[ 17.932292] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 17.937788] Bluetooth: BNEP filters: protocol multicast
[ 17.943116] Bluetooth: BNEP socket layer initialized
[ 17.987471] Bluetooth: RFCOMM TTY layer initialized
[ 17.992455] Bluetooth: RFCOMM socket layer initialized
[ 17.997771] Bluetooth: RFCOMM ver 1.11
root
root@raspberrypi3:~# uname -a
Linux raspberrypi3 4.4.50 #1 SMP Tue Jun 13 18:57:59 EEST 2017 armv7l GNU/LinuxI will apply the fix through the configurations in the recipes for Raspberry Pi 2/3 in meta-agl.
Best regards,
Leon
Hi,
The AGL image built from the source code of Chinook 3.0.3 is working as expected on Raspberry Pi 3 and there is output on the serial console. The AGL image built from master with the kernel of Chinook 3.0.3 also boots and shows output on the serial console. I am trying to figure out which configurations have been changed and cause the issue.
Best regards,
Leon
Hi,
According to the documentation of meta-raspberrypi the following configuration is required to enable UART and serial console for Raspberry Pi:
ENABLE_UART = "1"With this configuration works there is output from the serial console on Poky, both morty and master branch. The configuration is not present in AGL. My first attempt to enable UART for rpi3 using it in AGL didn't work. I am debugging further.
Best regards,
Leon
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Hi,
There is no output on the serial console while booting AGL on Raspberry Pi 3. Additional configurations are required to enable it again. I am working on this.
Best regards,
Leon