On Wed, 6 Feb 2013, Jean Delvare wrote:
The risk is relatively low, but it exists. If you want to make it as
low as possible, you can start with:
# i2cget 0 0x48
This will read the presumed internal pointer value from the chip. Write
down the value for future use. I'll call in $v below. Then try a single
register read:
# i2cget 0 0x48 $v
If it returns $v again, and $v is neither 0x00 nor 0xff, you better
leave the chip alone, and cold boot the machine (just in case.) In
other cases, the chip seem to behave normally and you can go with:
# i2cdump 0 0x48 b
So here we go:
root ~ # i2cget 0 0x48
WARNING! This program can confuse your I2C bus, cause data loss and worse!
I will read from device file /dev/i2c-0, chip address 0x48, current data
address, using read byte.
Continue? [Y/n]
0x3f
root ~ # i2cget 0 0x48 0x3f
WARNING! This program can confuse your I2C bus, cause data loss and worse!
I will read from device file /dev/i2c-0, chip address 0x48, data address
0x3f, using read byte data.
Continue? [Y/n]
Error: Read failed
root ~ # i2cget 0 0x48 b
Error: Data address invalid!
Usage: i2cget [-f] [-y] I2CBUS CHIP-ADDRESS [DATA-ADDRESS [MODE]]
I2CBUS is an integer or an I2C bus name
ADDRESS is an integer (0x03 - 0x77)
MODE is one of:
b (read byte data, default)
w (read word data)
c (write byte/read byte)
Append p for SMBus PEC
PS I now added dmidecode to the OpenELEC build system in order to find
other differences between both devices.
Good idea.
No important differences. The systems also runs the same kernel/ramdisk,
so I guess some nvram or bios setting is different, or it's the hardware.
Weird.
----
[dag@lisse ~]$ diff -u <(ssh root@xbmc01 dmidecode) <(ssh root@xbmc02 dmidecode)
--- /dev/fd/63 2013-02-06 13:10:19.476163195 +0100
+++ /dev/fd/62 2013-02-06 13:10:19.477163195 +0100
@@ -180,7 +180,7 @@
Manufacturer: Apple Inc.
Product Name: AppleTV1,1
Version: 1.0
- Serial Number: YM91505WXVG
+ Serial Number: YM809009YST
UUID: 9CFE245E-D0C8-BD45-A79F-54EA5FBD3D97
Wake-up Type: Power Switch
SKU Number: System SKU #
@@ -207,7 +207,7 @@
Type: Space-saving
Lock: Not Present
Version: Mac-F4228DC8
- Serial Number: YM91505WXVG
+ Serial Number: YM809009YST
Asset Tag: Asset Tag#
Boot-up State: Safe
Power Supply State: Safe
----
--
-- dag wieers, dag@xxxxxxxxxx, http://dag.wieers.com/
-- dagit linux solutions, info@xxxxxxxxx, http://dagit.net/
[Any errors in spelling, tact or fact are transmission errors]
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