[Arm-dev] kernel rebase for rpi2/rpi3 : call for feedback !

[Jordi Sanfeliu]

[SOLVED]

According to this thread 
<https://www.raspberrypi.org/forums/viewtopic.php?t=148713&p=978725> 
just adding the following line in the '/boot/config.txt' is enough to 
have '/dev/ttyS0' back again.

enable_uart=1

Thanks.


On 07/13/2016 12:03 PM, Jordi Sanfeliu wrote:
> Hello,
>
> I've discovered that with the new kernel the standard UART 16550
> (/dev/ttyS0) is not detected:
>
> with kernel 4.1.9-v7:
> ---------------------
> # dmesg | grep tty
> [    0.000000] Kernel command line: 8250.nr_uarts=1 dma.dmachans=0x7f35
> bcm2708_fb.fbwidth=976 bcm2708_fb.fbheight=736 bcm2709.boardrev=0xa02082
> bcm2709.serial=0xfa9d86a7 smsc95xx.macaddr=B8:27:EB:9D:86:A7
> bcm2708_fb.fbswap=1 bcm2709.uart_clock=48000000
> vc_mem.mem_base=0x3dc00000 vc_mem.mem_size=0x3f000000
> dwc_otg.lpm_enable=0 console=tty1 root=/dev/mmcblk0p3 rootfstype=ext4
> elevator=deadline rootwait ipv6.disable=1
> [    0.001289] console [tty1] enabled
> [    0.283910] 3f215040.uart: ttyS0 at MMIO 0x3f215040 (irq = 29,
> base_baud = 31250000) is a 16550
> [    0.998791] 3f201000.uart: ttyAMA0 at MMIO 0x3f201000 (irq = 83,
> base_baud = 0) is a PL011 rev2
> [    2.511900] systemd[1]: Created slice system-getty.slice.
> [    2.515620] systemd[1]: Starting system-getty.slice.
>
>
> with kernel 4.4.14-v7:
> ---------------------
> # dmesg | grep tty
> [    0.000000] Kernel command line: 8250.nr_uarts=0 dma.dmachans=0x7f35
> bcm2708_fb.fbwidth=1232 bcm2708_fb.fbheight=992
> bcm2709.boardrev=0xa02082 bcm2709.serial=0xda72ae64
> smsc95xx.macaddr=B8:27:EB:72:AE:64 bcm2708_fb.fbswap=1
> bcm2709.uart_clock=48000000 vc_mem.mem_base=0x3dc00000
> vc_mem.mem_size=0x3f000000  dwc_otg.lpm_enable=0 console=tty1
> root=/dev/mmcblk0p3 rootfstype=ext4 elevator=deadline rootwait
> ipv6_disable=1
> [    0.001336] console [tty1] enabled
> [    1.997145] 3f201000.uart: ttyAMA0 at MMIO 0x3f201000 (irq = 87,
> base_baud = 0) is a PL011 rev2
> [    3.271457] systemd[1]: Created slice system-getty.slice.
> [    3.276833] systemd[1]: Starting system-getty.slice.
>
>
> Can anyone confirm this?
> Thanks.
>

-- 
Jordi Sanfeliu
FIBRANET Network Services Provider
http://www.fibranet.cat