UART Register in BBB for writing a device driver.

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1

Hi

I am trying to get started with embedded linux.
I bought a Beagle bone black Rev C. It came with Debian linux kernel version 3.8,

I understand x86 architecture uses PC16550d IC UART hardware and its register address can be seen in /proc/ioports.

I was wondering if I can get information on UART hardware for BBB and its corresponding register address

Thanks.

2

Is this what you’re after ?

debian@beaglebone:~$ sudo apt-get update
debian@beaglebone:~$ sudo apt-get install setserial

debian@beaglebone:~$ sudo setserial -g /dev/ttyS[0123]
/dev/ttyS0, UART: 8250, Port: 0x0000, IRQ: 155
/dev/ttyS1, UART: unknown, Port: 0x0000, IRQ: 0
/dev/ttyS2, UART: unknown, Port: 0x0000, IRQ: 0
/dev/ttyS3, UART: unknown, Port: 0x0000, IRQ: 0

Anyway, if you’re unfamiliar with setserial I’d advise to run setserial -h first, and heed the warning near the end.

3

I was wondering if I can get information on UART hardware for BBB and its corresponding register address

Ah, ok I see. You’re wanting to get this information on existing, and running hardware. Or are you asking how does one know what to use for a base address ?

4

Programmatically? or documentation?