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"MMU.FORMAT LINUX swapper_pg_dir"
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Why does "MMU.FORMAT LINUX swapper_pg_dir" report "invalid combination"?
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Space IDs must be switched on for this command to work: "SYStem.Option MMUSPACES ON".
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"SYstem.Option MMU ON/OFF" Error
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Why does "SYstem.Option MMU ON/OFF" report "Cannot change from short to long"?
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This command executes only, if no symbols are loaded. Delete previous loaded symbols with "sYmbol.Delete".
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Kernel message "soft lockup"
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What does the kernel message soft lockup mean?
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Linux trace in simulator
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What is needed to revise a Linux trace with a TRACE32 instruction set simulator?
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Example for ARM926
SAVING IN TRACE32 DEBUGGER:
Trace.SAVE trace.ad ; save trace recording
Data.SAVE.Binary image.bin ASD:address_range ; save whole Linux address range
; including code area, data area
; and MMU table
Data.SAVE.Binary p15.bin C15:0x0--0xfff /Long ; save important CP15 registers
LOADING IN TRACE32 INSTRUCTION SET SIMULATOR:
SYStem.RESet
SYStem.CPU ARM926
SYStem.Option MMUspaces ON ; enable space-id
System.Up ; establish the communication between
; ARM926 andthe debugger
Data.LOAD.Binary image.bin ASD:address_range ; load Linux image
Data.LOAD.Binary cp15.bin c15:0 ; load important CP15 registers
Data.LOAD.Elf vmlinux /GNU /NOCODE ; load symbol information
; specifiy MMU table format
MMU.FORMAT linux swapper_pg_dir 0xc0000000--0xc1ffffff kernel_load_address
MMU.Create 0xc0000000--0xc1ffffff kernel_load_address
MMU.COMMON 0xc000000--0xfffffff
MMU.ON
MMU.SCANALL ; rescan MMU table
TASK.CONFIG linux ; configure Linux awareness
Menu.ReProgram linux
Help.Filter.ADD rtoslinux
Trace.LOAD trace.ad ; load trace recording
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Problems with Software Breakpoints
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After halting at a function entry point with an on-chip breakpoint, or after stepping into a new function, the Data.List window shows "???"for all assembler lines, even after rescanning the MMU.
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You probably fell over the demand paging mechanism of Linux.
Please read the "n-Demand Paging" chapter in the Linux Awareness Manual.
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TASK.MODULE Display Problems
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After loading a new kernel module, TASK.MODULE shows nothing, dashed lines or errors.
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The target MMU is changed when loading kernel modules. Rescan the target MMU with MMU.SCANALL.
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