diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /Documentation/arm/SA1100/serial_UART |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'Documentation/arm/SA1100/serial_UART')
-rw-r--r-- | Documentation/arm/SA1100/serial_UART | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/Documentation/arm/SA1100/serial_UART b/Documentation/arm/SA1100/serial_UART new file mode 100644 index 000000000000..aea2e91ca0ef --- /dev/null +++ b/Documentation/arm/SA1100/serial_UART | |||
@@ -0,0 +1,47 @@ | |||
1 | The SA1100 serial port had its major/minor numbers officially assigned: | ||
2 | |||
3 | > Date: Sun, 24 Sep 2000 21:40:27 -0700 | ||
4 | > From: H. Peter Anvin <hpa@transmeta.com> | ||
5 | > To: Nicolas Pitre <nico@CAM.ORG> | ||
6 | > Cc: Device List Maintainer <device@lanana.org> | ||
7 | > Subject: Re: device | ||
8 | > | ||
9 | > Okay. Note that device numbers 204 and 205 are used for "low density | ||
10 | > serial devices", so you will have a range of minors on those majors (the | ||
11 | > tty device layer handles this just fine, so you don't have to worry about | ||
12 | > doing anything special.) | ||
13 | > | ||
14 | > So your assignments are: | ||
15 | > | ||
16 | > 204 char Low-density serial ports | ||
17 | > 5 = /dev/ttySA0 SA1100 builtin serial port 0 | ||
18 | > 6 = /dev/ttySA1 SA1100 builtin serial port 1 | ||
19 | > 7 = /dev/ttySA2 SA1100 builtin serial port 2 | ||
20 | > | ||
21 | > 205 char Low-density serial ports (alternate device) | ||
22 | > 5 = /dev/cusa0 Callout device for ttySA0 | ||
23 | > 6 = /dev/cusa1 Callout device for ttySA1 | ||
24 | > 7 = /dev/cusa2 Callout device for ttySA2 | ||
25 | > | ||
26 | |||
27 | If you're not using devfs, you must create those inodes in /dev | ||
28 | on the root filesystem used by your SA1100-based device: | ||
29 | |||
30 | mknod ttySA0 c 204 5 | ||
31 | mknod ttySA1 c 204 6 | ||
32 | mknod ttySA2 c 204 7 | ||
33 | mknod cusa0 c 205 5 | ||
34 | mknod cusa1 c 205 6 | ||
35 | mknod cusa2 c 205 7 | ||
36 | |||
37 | In addition to the creation of the appropriate device nodes above, you | ||
38 | must ensure your user space applications make use of the correct device | ||
39 | name. The classic example is the content of the /etc/inittab file where | ||
40 | you might have a getty process started on ttyS0. In this case: | ||
41 | |||
42 | - replace occurrences of ttyS0 with ttySA0, ttyS1 with ttySA1, etc. | ||
43 | |||
44 | - don't forget to add 'ttySA0', 'console', or the appropriate tty name | ||
45 | in /etc/securetty for root to be allowed to login as well. | ||
46 | |||
47 | |||