u-boot/doc/README.log

42 Logging can come from a wide variety of places within U-Boot. Each log message
63    CONFIG_MAX_LOG_LEVEL - Max log level to build (anything higher is compiled
65    CONFIG_LOG_CONSOLE	- Enable writing log records to the console
101 With these the log level is implicit in the name. The category is set by
110 Remember that all uclasses IDs are log categories too.
116 The 'log' command provides access to several features:
118    level - access the default log level
119    format - access the console log format
120    rec - output a log record
123 Type 'help log' for details.
155 You can control the log format using the 'log format' command. The basic
160 In the above, file.c:123 is the filename where the log record was generated and
161 func() is the function name. By default ('log format default') only the
169 Filters are attached to log drivers to control what those drivers emit. Only
174    - maximum log level
187    log(category, level, format_string, ...)
189 Also debug() and error() will generate log records  - these use LOG_CATEGORY
198 This will write a log record when an error code is detected (a value < 0). This
236 Convert debug() statements in the code to log() statements
238 Support making printf() emit log statements a L_INFO level
240 Convert error() statements in the code to log() statements
246 Add a way to browse log records
248 Add a way to record log records for browsing using an external tool
252 Add commands to add and remove log devices
254 Allow sharing of printf format strings in log records to reduce storage size
255 for large numbers of log records
263 Consider making log() calls emit an automatic newline, perhaps with a logn()
266 Passing log records through to linux (e.g. via device tree /chosen)
268 Provide a command to access the number of log records generated, and the
269 number dropped due to them being generated before the log system was ready.
271 Add a printf() format string pragma so that log statements are checked properly
273 Enhance the log console driver to show level / category / file / line
276 Add a command to add new log records and delete existing records.
278 Provide additional log() functions - e.g. logc() to specify the category