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https://www.cateee.net/lkddb/web-lkddb/DYNAMIC_DEBUG.html
Dynamic debugging is controlled via the 'dynamic_debug/control' file, which is contained in the 'debugfs' filesystem. Thus, the debugfs filesystem must first be mounted before making use of this feature. We refer the control file as: <debugfs>/dynamic_debug/control. This file contains a list of the debug statements that can be enabled.
https://cateee.net/lkddb/web-lkddb/DYNAMIC_PRINTK_DEBUG.html
Dynamic debugging is controlled by the debugfs file, dynamic_printk/modules. This file contains a list of the modules that can be enabled. The format of the file is the module name, followed by a set of flags that can be enabled. The first flag is always the 'enabled' flag. For example: <module_name> <enabled=0/1> . . .
https://community.nxp.com/docs/DOC-335495
Oct 10, 2017 · To enable the Linux dynamic debug, select the option "Enable dynamic printk() support" on Kernel menuconfig as following: Kernel hacking ---> printk and dmesg options ---> [*] Enable dynamic printk() support
https://training.ti.com/sites/default/files/docs/Kernel-Debug-Series-Part4-dynamic-debug.pdf
Debugging Embedded Linux Systems: Dynamic Debug Debugging Embedded Linux Training Series [ Part 4]
https://www.kernel.org/doc/html/v4.11/admin-guide/dynamic-debug-howto.html
Controlling dynamic debug Behaviour¶ The behaviour of pr_debug() / dev_dbg() are controlled via writing to a control file in the ‘debugfs’ filesystem. Thus, you must first mount the debugfs filesystem, in order to make use of this feature. Subsequently, we refer to the control file as: <debugfs>/dynamic_debug/control.
https://www.linux.org/threads/the-linux-kernel-configuring-the-kernel-part-22.9407/
Dec 08, 2013 · The printk() function can be made to print various debugging messages if this feature is enabled (Enable dynamic printk() support). “printk()” is a commonly discussed system call, so remember that it prints debugging messages about the kernel. Here is a Direct Memory Access (DMA) debugging driver (Enable debugging of DMA-API usage).
https://www.linux.org/attachments/the_linux_kernel_series_3-pdf.1541/
(Enable dynamic printk() support). “printk()” is a commonly d iscussed system call, so remember that it prints debugging message s about the kernel. Here is a Direct M emory Acc ess (DMA) debugging driver (Enable d ebugging of D MAAPI usage).
https://knowledge.autodesk.com/support/autocad/learn-explore/caas/sfdcarticles/sfdcarticles/How-to-enable-or-disable-dynamic-input-in-AutoCAD.html
How to enable or disable dynamic input in AutoCAD so that the crosshairs show or do not show changing length, size, angle, etc. while drawing objects. ... Get answers fast from Autodesk support staff and product experts in the forums. Visit AutoCAD forum. AutoCAD Ideas. Share and vote on ideas for future product releases.
https://elinux.org/Debugging_by_printing
For the early stages in the boot process, where no console is available yet, there is a special function named early_printk, this function writes directly to the VGA buffer or a serial line but otherwise works just like printk -- you have to enable this function by setting CONFIG_EARLY_PRINTK in your kernel config (make menuconfig -> Kernel Hacking -> Early printk).
https://stackoverflow.com/questions/16620693/printk-stopped-writing-to-after-booting-into-new-compiled-kernel
I have compiled latest Linux kernel version (3.7.6) on my VMware machine and was able to successfully boot into new kernel, however for some reason I am not able to view printk messages from kernel...
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