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Diffstat (limited to 'docs/i2c-debugging.md')
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diff --git a/docs/i2c-debugging.md b/docs/i2c-debugging.md index 7ab84f9d8d..304f72aa2c 100644 --- a/docs/i2c-debugging.md +++ b/docs/i2c-debugging.md @@ -1,54 +1,5 @@ -I²C Debugging Tips -================== +*** note +**Warning: This document is old & has moved. Please update any links:**<br> +https://chromium.googlesource.com/chromiumos/platform/ec/+/HEAD/docs/i2c-debugging.md +*** -The EC codebase has functionality to help you debug I²C errors without -pulling out the scope. Some of the debug functionality is disabled by -default to save space, but can be enabled with the `CONFIG_I2C_DEBUG` -option. - -Tracing -------- - -You can use the `i2ctrace` command to monitor (ranges of) addresses: - -``` -i2ctrace [list - | disable <id> - | enable <port> <address> - | enable <port> <address-low> <address-high>] -``` - -For example: - -``` -> i2ctrace enable 0 0x10 0x30 -> i2ctrace enable 1 0x20 -> i2ctrace list -id port address --- ---- ------- -0 0 0x10 to 0x30 -1 1 0x40 to 0x50 -... debug spam may follow ... -i2c: 1:0x20 wr 0x10 rd 0x01 0x00 -i2c: 1:0x20 wr 0x10 0x01 0x00 -... -> i2ctrace disable 1 -> i2ctrace list -id port address --- ---- ------- -0 0 0x10 to 0x30 -``` - -A maximum of 8 debug entries are supported at a single time. - -Note that `i2ctrace enable` will merge debug entries when possible: - -``` -> i2ctrace enable 0 0x10 0x30 -> i2ctrace enable 0 0x40 0x50 -> i2ctrace enable 0 0x31 0x3f -> i2ctrace list -id port address --- ---- ------- -0 0 0x10 to 0x50 -```
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