13054fd168
eepromread could only read EEPROMs through the /dev/i2c interface. Once the cat24c256 driver is started and claims/reserves the device, it can no longer be read through the /dev/i2c interface. This patch adds support for reading from EEPROMs through the /dev/eeprom interface. For example, to read the on-board eeprom on the BBB, one would do `eepromread -f /dev/eepromb1s50 -i`. Change-Id: If08ce37231e593982eeb109bdd6d5458ad271108
60 lines
1.7 KiB
Groff
60 lines
1.7 KiB
Groff
.TH EEPROMREAD 1
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.SH NAME
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eepromread \- read data from an EEPROM
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.SH SYNOPSIS
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\fBeepromread\fR [\fB\-i\fR] [\fB\-f\fR \fIdev\fR] [\fB\-a\fR \fIslave_addr\fR]
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[\fB\-n\fR]
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.br
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.de FL
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.TP
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\\fB\\$1\\fR
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\\$2
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..
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.de EX
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.TP 20
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\\fB\\$1\\fR
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# \\$2
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..
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.SH OPTIONS
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.TP 5
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.B \-i
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# interpret the data on the EEPROM and display it as a set of fields.
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.TP 5
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.B \-f
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# Use \fIdevice\fR instead of \fI/dev/i2c-1\fR.
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.TP 5
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.B \-a
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# Use \fIslave_address\fR instead of \fI0x50\fR.
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.TP 5
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.B \-n
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# Do not send the page number when addressing the memory on the EEPROM. Some
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smaller EEPROM chips aren't organized into pages and get confused if a page
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number is sent with the memory address. Use this when reading EDID.
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.SH EXAMPLES
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.TP 20
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.B eepromread -i
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# display the contents of the EEPROM as a list of label:value pairs.
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.TP 20
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.B eepromread
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# display the first 256 bytes of the EEPROM in HEX and ASCII.
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.TP 20
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.B eepromread -f /dev/i2c-3 -a 0x54
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# display the first 256 bytes of the EEPROM on I2C bus 3, slave address 0x54.
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.TP 20
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.B eepromread -f /dev/i2c-3 -n
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# read the EDID info from the display on I2C bus 3 on the BeagleBoard-xM.
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.TP 20
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.B eepromread -f /dev/eepromb1s50 -i
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# access the EEPROM through the /dev/eeprom interface once the
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cat24c256 driver has been started.
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.SH DESCRIPTION
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.PP
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\fIeepromread\fR is a simple tool for viewing the contents of an EEPROM.
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For EEPROM data that is in a specific format that this program knows how to
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detect, \fIeepromread\fR can properly format each of the fields and display
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the information via the \fI-i\fR command line option.
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.SH NOTES
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If the \fIcat24c256\fR driver has claimed the EEPROM device that this
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program is attempting to read from, then you must access it through
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the /dev/eeprom interface rather than the /dev/i2c interface.
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