diff options
| -rw-r--r-- | CHANGES | 1 | ||||
| -rw-r--r-- | tools/i2cdetect.8 | 12 |
2 files changed, 9 insertions, 4 deletions
@@ -8,6 +8,7 @@ SVN HEAD Update manufacturer IDs Remove duplicate "ns" in SDR timings Fix decoding of SDR SPD revision + i2cdetect: Clarify the SMBus commands used for probing by default i2c-dev.h: Minimize differences with kernel flavor Move SMBus helper functions to include/i2c/smbus.h i2c-stub-from-dump: Be more tolerant on input dump format diff --git a/tools/i2cdetect.8 b/tools/i2cdetect.8 index 47cad04..ef5cda2 100644 --- a/tools/i2cdetect.8 +++ b/tools/i2cdetect.8 @@ -28,6 +28,12 @@ should correspond to one of the busses listed by \fIi2cdetect -l\fR. The optional parameters \fIfirst\fR and \fIlast\fR restrict the scanning range (default: from 0x03 to 0x77). .PP +As there is no standard I2C detection command, i2cdetect uses arbitrary +SMBus commands (namely SMBus quick write and SMBus receive byte) to probe +for devices. By default, the command used is the one believed to be the +safest for each address. See options \fI-q\fR and \fI-r\fR to change this +behavior. +.PP i2cdetect can also be used to query the functionalities of an I2C bus (see option \fB-F\fP.) @@ -57,14 +63,12 @@ scripts. Force scanning of non-regular addresses. Not recommended. .TP .B "\-q" -Use SMBus "quick write" commands for probing (by default, the command -used is the one believed to be the safest for each address). +Use SMBus "quick write" command for probing. Not recommended. This is known to corrupt the Atmel AT24RF08 EEPROM found on many IBM Thinkpad laptops. .TP .B "\-r" -Use SMBus "read byte" commands for probing (by default, the command -used is the one believed to be the safest for each address). +Use SMBus "receive byte" command for probing. Not recommended. This is known to lock SMBus on various write-only chips (most notably clock chips at address 0x69). .TP |