What: /sys/kernel/debug/dcc/.../ready Date: December 2022 Contact: Souradeep Chowdhury Description: This file is used to check the status of the dcc hardware if it's ready to take the inputs. A 'Y' here indicates dcc is in a ready condition. Example: cat /sys/kernel/debug/dcc/.../ready What: /sys/kernel/debug/dcc/.../trigger Date: December 2022 Contact: Souradeep Chowdhury Description: This is the debugfs interface for manual software triggers. The user can simply enter a 1 against the debugfs file and enable a manual trigger. Example: echo 1 > /sys/kernel/debug/dcc/.../trigger What: /sys/kernel/debug/dcc/.../config_reset Date: December 2022 Contact: Souradeep Chowdhury Description: This file is used to reset the configuration of a dcc driver to the default configuration. This means that all the previous addresses stored in the driver gets removed and user needs to enter the address values from the start. Example: echo 1 > /sys/kernel/debug/dcc/../config_reset What: /sys/kernel/debug/dcc/.../[list-number]/config Date: December 2022 Contact: Souradeep Chowdhury Description: This stores the addresses of the registers which should be read in case of a hardware crash or manual software triggers. The addresses entered here are considered under all the 4 types of dcc instructions Read type, Write type, Read Modify Write type and Loop type. The lists need to be configured sequentially and not in a overlapping manner. As an example user can jump to list x only after list y is configured and enabled. The format for entering all types of instructions are explained in examples as follows. Example: i)Read Type Instruction echo R <1> <2> <3> >/sys/kernel/debug/dcc/../[list-number]/config 1->Address to be considered for reading the value. 2->The word count of the addresses, read n words starting from address <1>. Each word is of 32 bits. If not entered 1 is considered. 3->Can be 'apb' or 'ahb' which indicates if it is apb or ahb bus respectively. If not entered ahb is considered. ii)Write Type Instruction echo W <1> <2> <3> > /sys/kernel/debug/dcc/../[list-number]/config 1->Address to be considered for writing the value. 2->The value that needs to be written at the location. 3->Can be a 'apb' or 'ahb' which indicates if it is apb or ahb but respectively. iii)Read Modify Write type instruction echo RW <1> <2> <3> > /sys/kernel/debug/dcc/../[list-number]/config 1->The address which needs to be considered for read then write. 2->The value that needs to be written on the address. 3->The mask of the value to be written. iv)Loop Type Instruction echo L <1> <2> <3> > /sys/kernel/debug/dcc/../[list-number]/config 1->The loop count, the number of times the value of the addresses will be captured. 2->The address count, total number of addresses to be entered in this instruction. 3->The series of addresses to be entered separated by a space like ... and so on. What: /sys/kernel/debug/dcc/.../[list-number]/enable Date: December 2022 Contact: Souradeep Chowdhury Description: This debugfs interface is used for enabling the the dcc hardware. Enable file is kept under the directory list number for which the user wants to enable it. For example if the user wants to enable list 1, then he should go for echo 1 > /sys/kernel/debug/dcc/.../1/enable. On enabling the dcc, all the addresses entered by the user for the corresponding list is written into dcc sram which is read by the dcc hardware on manual or crash induced triggers. Lists should be enabled sequentially.For example after configuring addresses for list 1 and enabling it, a user can proceed to enable list 2 or vice versa. Example: echo 0 > /sys/kernel/debug/dcc/.../[list-number]/enable (disable dcc for the corresponding list number) echo 1 > /sys/kernel/debug/dcc/.../[list-number]/enable (enable dcc for the corresponding list number)