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