| The SA1100 serial port had its major/minor numbers officially assigned: | |
| > Date: Sun, 24 Sep 2000 21:40:27 -0700 | |
| > From: H. Peter Anvin <hpa@transmeta.com> | |
| > To: Nicolas Pitre <nico@CAM.ORG> | |
| > Cc: Device List Maintainer <device@lanana.org> | |
| > Subject: Re: device | |
| > | |
| > Okay. Note that device numbers 204 and 205 are used for "low density | |
| > serial devices", so you will have a range of minors on those majors (the | |
| > tty device layer handles this just fine, so you don't have to worry about | |
| > doing anything special.) | |
| > | |
| > So your assignments are: | |
| > | |
| > 204 char Low-density serial ports | |
| > 5 = /dev/ttySA0 SA1100 builtin serial port 0 | |
| > 6 = /dev/ttySA1 SA1100 builtin serial port 1 | |
| > 7 = /dev/ttySA2 SA1100 builtin serial port 2 | |
| > | |
| > 205 char Low-density serial ports (alternate device) | |
| > 5 = /dev/cusa0 Callout device for ttySA0 | |
| > 6 = /dev/cusa1 Callout device for ttySA1 | |
| > 7 = /dev/cusa2 Callout device for ttySA2 | |
| > | |
| You must create those inodes in /dev on the root filesystem used | |
| by your SA1100-based device: | |
| mknod ttySA0 c 204 5 | |
| mknod ttySA1 c 204 6 | |
| mknod ttySA2 c 204 7 | |
| mknod cusa0 c 205 5 | |
| mknod cusa1 c 205 6 | |
| mknod cusa2 c 205 7 | |
| In addition to the creation of the appropriate device nodes above, you | |
| must ensure your user space applications make use of the correct device | |
| name. The classic example is the content of the /etc/inittab file where | |
| you might have a getty process started on ttyS0. In this case: | |
| - replace occurrences of ttyS0 with ttySA0, ttyS1 with ttySA1, etc. | |
| - don't forget to add 'ttySA0', 'console', or the appropriate tty name | |
| in /etc/securetty for root to be allowed to login as well. | |