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Old 08-22-2017, 06:36 AM   #1
justwantin
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Registered: Aug 2003
Location: Melbourne, Australia
Distribution: Slackware, Slackwarearm
Posts: 700

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enabling uart4 and uart7 on a Banana Pro


I spent several hours today trying to find a solution for this to no avail. Perhaps I didn't have the right search words.

There are three uart devices on my Banana Pro after boot. uart0, /dev/ttyS0, is reserved for terminal comm but I should be able to use uart4, /dev/ttyS1 and uart7, /dev/ttyS1, for other things, however, only /dev/ttyS0 is enabled at boot.
Code:
rick@bpro10:~$ dmesg | grep tty
[    0.000000] Kernel command line: console=ttyS0,115200n8 TERM=screen-256color root=/dev/sda1 waitforroot=3 rootfstype=ext4
[    0.954485] console [ttyS0] disabled
[    0.974724] 1c28000.serial: ttyS0 at MMIO 0x1c28000 (irq = 45, base_baud = 1500000) is a U6_16550A
[    1.671234] console [ttyS0] enabled
[    1.698214] 1c29000.serial: ttyS1 at MMIO 0x1c29000 (irq = 46, base_baud = 1500000) is a U6_16550A
[    1.730585] 1c29c00.serial: ttyS2 at MMIO 0x1c29c00 (irq = 47, base_baud = 1500000) is a U6_16550A

root@bpro10:/home/rick# cat /proc/tty/driver/serial
serinfo:1.0 driver revision:
0: uart:U6_16550A mmio:0x01C28000 irq:45 tx:8684 rx:0 RTS|DTR
1: uart:U6_16550A mmio:0x01C29000 irq:46 tx:0 rx:0
2: uart:U6_16550A mmio:0x01C29C00 irq:47 tx:0 rx:0
I decompiled sun7i-a20-bananapro.dtb with dtc and had a squiz. The nodes in the dts file for uart4 and uart7 seem complete and correct when compared with the corresponding uart0 nodes and all three are set "status = "okay"; and not "status = "disabled";"

This leads me to thinks that there is something else I need to do to enable /dev/ttyS1 and /dev/ttyS2 but I have yet to find or figure out what to do.

Last edited by justwantin; 08-26-2017 at 06:36 PM.
 
Old 08-22-2017, 06:43 AM   #2
SCerovec
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Registered: Oct 2006
Location: Cp6uja
Distribution: Slackware on x86 and arm
Posts: 1,168
Blog Entries: 2

Rep: Reputation: 166Reputation: 166
did You try hard-coded inodes in /dev ?

Sometimes i copy an install "root to root" and I omit the usual suspects:

Code:
/dev
/syc
/proc
and on some occasions the boot (or whatever) fails until i manually copy the /dev in offline mode (while the OS has no generated/"mirrored" links in it)

get an live linux and compare the /dev/ of running and offline Slackware Your self (or examine one of the aaa*.tgz packages holding the root tree)

hope this helps?
 
Old 08-26-2017, 06:35 PM   #3
justwantin
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Registered: Aug 2003
Location: Melbourne, Australia
Distribution: Slackware, Slackwarearm
Posts: 700

Original Poster
Rep: Reputation: 71
This was a very trivial problem that I certainly did a good job complicating. I could enable uart1 using stty
Code:
root@bpro10:/home/rick# cat /proc/tty/driver/serial
serinfo:1.0 driver revision:
0: uart:U6_16550A mmio:0x01C28000 irq:45 tx:8684 rx:0 RTS|DTR
1: uart:U6_16550A mmio:0x01C29000 irq:46 tx:0 rx:0
2: uart:U6_16550A mmio:0x01C29C00 irq:47 tx:0 rx:0
3: uart:unknown port:00000000 irq:0

root@bpro10:/home/rick# stty -F /dev/ttyS1 9600

root@bpro10:/home/rick# cat /proc/tty/driver/serial
serinfo:1.0 driver revision:
0: uart:U6_16550A mmio:0x01C28000 irq:45 tx:8694 rx:0 RTS|DTR
1: uart:U6_16550A mmio:0x01C29000 irq:46 tx:30 rx:9377 fe:1 brk:9363 RTS|DTR
2: uart:U6_16550A mmio:0x01C29C00 irq:47 tx:0 rx:0
3: uart:unknown port:00000000 irq:0

Last edited by justwantin; 08-26-2017 at 06:37 PM. Reason: tyop
 
Old 08-27-2017, 04:39 AM   #4
SCerovec
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Registered: Oct 2006
Location: Cp6uja
Distribution: Slackware on x86 and arm
Posts: 1,168
Blog Entries: 2

Rep: Reputation: 166Reputation: 166
so there merely was no tty connected?
 
  


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