Commit 54cebc68 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney/blackfin-2.6 

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney/blackfin-2.6: (60 commits)
  Blackfin arch: make sure we include the fix for SPORT hysteresis when reprogramming clocks
  Blackfin arch: Fix bogus str_ident check in gpio code
  Blackfin arch: AD7879 Touchscreen driver
  Blackfin arch: introducing bfin_addr_dcachable
  Blackfin arch: fix a typo in comments
  Blackfin arch: Remove useless head file
  Blackfin arch: make sure L2 start and length are always defined (fixes building on BF542)
  Blackfin arch: use the Blackfin on-chip ROM to do software reset when possible
  Blackfin arch: update anomaly headers to match the latest sheet
  Blackfin arch: bfin_reset() is an internal reboot function ... everyone should go through machine_restart()
  Blackfin arch: print out error/warning if you are running on the incorrect CPU type
  Blackfin arch: remove non-bf54x ifdef logic since this file is only compiled on bf54x parts
  Blackfin arch: update board defconfigs
  Blackfin arch: Add optional verbose debug
  Blackfin arch: emulate a TTY over the EMUDAT/JTAG interface
  Blackfin arch: have is_user_addr_valid() check for overflows (like when address is -1)
  Blackfin arch: ptrace - fix off-by-one check on end of memory regions
  Blackfin arch: Enable framebuffer support for the BF526-EZkit TFT LCD display
  Blackfin arch: flash memory map and dm9000 resources updating
  Blackfin arch: early prink code still use uart core console functions to parse and set configure option string
  ...
parents fffdedef 71de1f8a

Documentation/blackfin/kgdb.txt

deleted100644 → 0
+0 −155
Original line number Diff line number Diff line 
			A Simple Guide to Configure KGDB



			Sonic Zhang <sonic.zhang@analog.com>

				Aug. 24th 2006





This KGDB patch enables the kernel developer to do source level debugging on

the kernel for the Blackfin architecture.  The debugging works over either the

ethernet interface or one of the uarts.  Both software breakpoints and

hardware breakpoints are supported in this version.

http://docs.blackfin.uclinux.org/doku.php?id=kgdb





2 known issues:

1. This bug:

       http://blackfin.uclinux.org/tracker/index.php?func=detail&aid=544&group_id=18&atid=145

   The GDB client for Blackfin uClinux causes incorrect values of local

   variables to be displayed when the user breaks the running of kernel in GDB.

2. Because of a hardware bug in Blackfin 533 v1.0.3:

       05000067 - Watchpoints (Hardware Breakpoints) are not supported

   Hardware breakpoints cannot be set properly.





Debug over Ethernet:

 

1. Compile and install the cross platform version of gdb for blackfin, which

   can be found at $(BINROOT)/bfin-elf-gdb.



2. Apply this patch to the 2.6.x kernel.  Select the menuconfig option under

   "Kernel hacking" -> "Kernel debugging" -> "KGDB: kernel debug with remote gdb".

   With this selected, option "Full Symbolic/Source Debugging support" and 

   "Compile the kernel with frame pointers" are also selected.



3. Select option "KGDB: connect over (Ethernet)".  Add "kgdboe=@target-IP/,@host-IP/" to

   the option "Compiled-in Kernel Boot Parameter" under "Kernel hacking".



4. Connect minicom to the serial port and boot the kernel image.



5. Configure the IP "/> ifconfig eth0 target-IP"



6. Start GDB client "bfin-elf-gdb vmlinux".



7. Connect to the target "(gdb) target remote udp:target-IP:6443".



8. Set software breakpoint "(gdb) break sys_open".



9. Continue "(gdb) c".



10. Run ls in the target console "/> ls".



11. Breakpoint hits. "Breakpoint 1: sys_open(..."



12. Display local variables and function paramters.

    (*) This operation gives wrong results, see known issue 1.



13. Single stepping "(gdb) si".



14. Remove breakpoint 1. "(gdb) del 1"



15. Set hardware breakpoint "(gdb) hbreak sys_open".



16. Continue "(gdb) c".



17. Run ls in the target console "/> ls".



18. Hardware breakpoint hits. "Breakpoint 1: sys_open(...".

    (*) This hardware breakpoint will not be hit, see known issue 2.



19. Continue "(gdb) c".



20. Interrupt the target in GDB "Ctrl+C".



21. Detach from the target "(gdb) detach".



22. Exit GDB "(gdb) quit".





Debug over the UART:



1. Compile and install the cross platform version of gdb for blackfin, which

   can be found at $(BINROOT)/bfin-elf-gdb.



2. Apply this patch to the 2.6.x kernel.  Select the menuconfig option under

   "Kernel hacking" -> "Kernel debugging" -> "KGDB: kernel debug with remote gdb".

   With this selected, option "Full Symbolic/Source Debugging support" and 

   "Compile the kernel with frame pointers" are also selected.



3. Select option "KGDB: connect over (UART)".  Set "KGDB: UART port number" to be

   a different one from the console.  Don't forget to change the mode of

   blackfin serial driver to PIO.  Otherwise kgdb works incorrectly on UART.

 

4. If you want connect to kgdb when the kernel boots, enable

   "KGDB: Wait for gdb connection early" 



5. Compile kernel.



6. Connect minicom to the serial port of the console and boot the kernel image.



7. Start GDB client "bfin-elf-gdb vmlinux".



8. Set the baud rate in GDB "(gdb) set remotebaud 57600".



9. Connect to the target on the second serial port "(gdb) target remote /dev/ttyS1".



10. Set software breakpoint "(gdb) break sys_open".



11. Continue "(gdb) c". 



12. Run ls in the target console "/> ls". 



13. A breakpoint is hit. "Breakpoint 1: sys_open(..."



14. All other operations are the same as that in KGDB over Ethernet. 





Debug over the same UART as console:



1. Compile and install the cross platform version of gdb for blackfin, which

   can be found at $(BINROOT)/bfin-elf-gdb.



2. Apply this patch to the 2.6.x kernel.  Select the menuconfig option under

   "Kernel hacking" -> "Kernel debugging" -> "KGDB: kernel debug with remote gdb".

   With this selected, option "Full Symbolic/Source Debugging support" and 

   "Compile the kernel with frame pointers" are also selected.



3. Select option "KGDB: connect over UART".  Set "KGDB: UART port number" to console.

   Don't forget to change the mode of blackfin serial driver to PIO.

   Otherwise kgdb works incorrectly on UART.

 

4. If you want connect to kgdb when the kernel boots, enable

   "KGDB: Wait for gdb connection early" 



5. Connect minicom to the serial port and boot the kernel image. 



6. (Optional) Ask target to wait for gdb connection by entering Ctrl+A. In minicom, you should enter Ctrl+A+A.



7. Start GDB client "bfin-elf-gdb vmlinux".



8. Set the baud rate in GDB "(gdb) set remotebaud 57600".



9. Connect to the target "(gdb) target remote /dev/ttyS0".



10. Set software breakpoint "(gdb) break sys_open".



11. Continue "(gdb) c". Then enter Ctrl+C twice to stop GDB connection.



12. Run ls in the target console "/> ls". Dummy string can be seen on the console.



13. Then connect the gdb to target again. "(gdb) target remote /dev/ttyS0".

    Now you will find a breakpoint is hit. "Breakpoint 1: sys_open(..."



14. All other operations are the same as that in KGDB over Ethernet.  The only

    difference is that after continue command in GDB, please stop GDB

    connection by 2 "Ctrl+C"s and connect again after breakpoints are hit or

    Ctrl+A is entered.

arch/blackfin/Kconfig

+56 −19
Original line number Diff line number Diff line
@@ -162,16 +162,28 @@ config BF549 
config BF561

	bool "BF561"

	help

	  Not Supported Yet - Work in progress - BF561 Processor Support.

	  BF561 Processor Support.



endchoice



config BF_REV_MIN

	int

	default 0 if (BF52x || BF54x)

	default 2 if (BF537 || BF536 || BF534)

	default 3 if (BF561 ||BF533 || BF532 || BF531)



config BF_REV_MAX

	int

	default 2 if (BF52x || BF54x)

	default 3 if (BF537 || BF536 || BF534)

	default 5 if (BF561)

	default 6 if (BF533 || BF532 || BF531)



choice

	prompt "Silicon Rev"

	default BF_REV_0_1 if BF527

	default BF_REV_0_2 if BF537

	default BF_REV_0_3 if BF533

	default BF_REV_0_0 if BF549

	default BF_REV_0_1 if (BF52x || BF54x)

	default BF_REV_0_2 if (BF534 || BF536 || BF537)

	default BF_REV_0_3 if (BF531 || BF532 || BF533 || BF561)



config BF_REV_0_0

	bool "0.0"
@@ -183,7 +195,7 @@ config BF_REV_0_1 


config BF_REV_0_2

	bool "0.2"

	depends on (BF537 || BF536 || BF534)

	depends on (BF52x || BF537 || BF536 || BF534 || BF54x)



config BF_REV_0_3

	bool "0.3"
@@ -197,6 +209,10 @@ config BF_REV_0_5 
	bool "0.5"

	depends on (BF561 || BF533 || BF532 || BF531)



config BF_REV_0_6

	bool "0.6"

	depends on (BF533 || BF532 || BF531)



config BF_REV_ANY

	bool "any"
@@ -249,7 +265,7 @@ config MEM_MT48LC8M32B2B5_7 


config MEM_MT48LC32M16A2TG_75

	bool

	depends on (BFIN527_EZKIT || BFIN532_IP0X || BLACKSTAMP)

	depends on (BFIN527_EZKIT || BFIN532_IP0X || BLACKSTAMP || BFIN526_EZBRD)

	default y



source "arch/blackfin/mach-bf527/Kconfig"
@@ -286,13 +302,20 @@ config BOOT_LOAD 
	  memory region is used to capture NULL pointer references as well

	  as some core kernel functions.



config ROM_BASE

	hex "Kernel ROM Base"

	default "0x20040000"

	range 0x20000000 0x20400000 if !(BF54x || BF561)

	range 0x20000000 0x30000000 if (BF54x || BF561)

	help



comment "Clock/PLL Setup"



config CLKIN_HZ

	int "Frequency of the crystal on the board in Hz"

	default "11059200" if BFIN533_STAMP

	default "27000000" if BFIN533_EZKIT

	default "25000000" if (BFIN537_STAMP || BFIN527_EZKIT || H8606_HVSISTEMAS || BLACKSTAMP)

	default "25000000" if (BFIN537_STAMP || BFIN527_EZKIT || H8606_HVSISTEMAS || BLACKSTAMP || BFIN526_EZBRD)

	default "30000000" if BFIN561_EZKIT

	default "24576000" if PNAV10

	default "10000000" if BFIN532_IP0X
@@ -332,7 +355,7 @@ config VCO_MULT 
	default "22" if BFIN533_BLUETECHNIX_CM

	default "20" if (BFIN537_BLUETECHNIX_CM || BFIN527_BLUETECHNIX_CM || BFIN561_BLUETECHNIX_CM)

	default "20" if BFIN561_EZKIT

	default "16" if (H8606_HVSISTEMAS || BLACKSTAMP)

	default "16" if (H8606_HVSISTEMAS || BLACKSTAMP || BFIN526_EZBRD)

	help

	  This controls the frequency of the on-chip PLL. This can be between 1 and 64.

	  PLL Frequency = (Crystal Frequency) * (this setting)
@@ -368,14 +391,6 @@ config SCLK_DIV 
	  This can be between 1 and 15

	  System Clock = (PLL frequency) / (this setting)



config MAX_MEM_SIZE

	int "Max SDRAM Memory Size in MBytes"

	depends on !MPU

	default 512

	help

	  This is the max memory size that the kernel will create CPLB

	  tables for.  Your system will not be able to handle any more.



choice

	prompt "DDR SDRAM Chip Type"

	depends on BFIN_KERNEL_CLOCK
@@ -389,6 +404,14 @@ config MEM_MT46V32M16_5B 
	bool "MT46V32M16_5B"

endchoice



config MAX_MEM_SIZE

	int "Max SDRAM Memory Size in MBytes"

	depends on !MPU

	default 512

	help

	  This is the max memory size that the kernel will create CPLB

	  tables for.  Your system will not be able to handle any more.



#

# Max & Min Speeds for various Chips

#
@@ -455,8 +478,6 @@ config CYCLES_CLOCKSOURCE 


source kernel/time/Kconfig



comment "Memory Setup"



comment "Misc"



choice
@@ -622,6 +643,15 @@ config CPLB_SWITCH_TAB_L1 
	  If enabled, the CPLB Switch Tables are linked

	  into L1 data memory. (less latency)



config APP_STACK_L1

	bool "Support locating application stack in L1 Scratch Memory"

	default y

	help

	  If enabled the application stack can be located in L1

	  scratch memory (less latency).



	  Currently only works with FLAT binaries.



comment "Speed Optimizations"

config BFIN_INS_LOWOVERHEAD

	bool "ins[bwl] low overhead, higher interrupt latency"
@@ -755,6 +785,13 @@ config BFIN_WT 


endchoice



config BFIN_L2_CACHEABLE

	bool "Cache L2 SRAM"

	depends on (BFIN_DCACHE || BFIN_ICACHE) && (BF54x || BF561)

	default n

	help

	  Select to make L2 SRAM cacheable in L1 data and instruction cache.



config MPU

	bool "Enable the memory protection unit (EXPERIMENTAL)"

	default n

arch/blackfin/Kconfig.debug

+55 −0
Original line number Diff line number Diff line
@@ -2,6 +2,22 @@ menu "Kernel hacking" 


source "lib/Kconfig.debug"



config HAVE_ARCH_KGDB

       def_bool y



config DEBUG_VERBOSE

	bool "Verbose fault messages"

	default y

	select PRINTK

	help

	  When a program crashes due to an exception, or the kernel detects

	  an internal error, the kernel can print a not so brief message

	  explaining what the problem was. This debugging information is

	  useful to developers and kernel hackers when tracking down problems,

	  but mostly meaningless to other people. This is always helpful for

	  debugging but serves no purpose on a production system.

	  Most people should say N here.



config DEBUG_MMRS

	bool "Generate Blackfin MMR tree"

	select DEBUG_FS
@@ -22,6 +38,44 @@ config DEBUG_HWERR 
	  hardware error interrupts and need to know where they are coming

	  from.



config DEBUG_DOUBLEFAULT

	bool "Debug Double Faults"

	default n

	help

	  If an exception is caused while executing code within the exception

	  handler, the NMI handler, the reset vector, or in emulator mode,

	  a double fault occurs. On the Blackfin, this is a unrecoverable

	  event. You have two options:

	  - RESET exactly when double fault occurs. The excepting

	    instruction address is stored in RETX, where the next kernel

	    boot will print it out.

	  - Print debug message. This is much more error prone, although

	    easier to handle. It is error prone since:

	    - The excepting instruction is not committed.

	    - All writebacks from the instruction are prevented.

	    - The generated exception is not taken.

	    - The EXCAUSE field is updated with an unrecoverable event

	    The only way to check this is to see if EXCAUSE contains the

	    unrecoverable event value at every exception return. By selecting

	    this option, you are skipping over the faulting instruction, and 

	    hoping things stay together enough to print out a debug message.



	  This does add a little kernel code, but is the only method to debug

	  double faults - if unsure say "Y"



choice

	prompt "Double Fault Failure Method"

	default DEBUG_DOUBLEFAULT_PRINT

	depends on DEBUG_DOUBLEFAULT



config DEBUG_DOUBLEFAULT_PRINT

	bool "Print"



config DEBUG_DOUBLEFAULT_RESET

	bool "Reset"



endchoice



config DEBUG_ICACHE_CHECK

	bool "Check Instruction cache coherency"

	depends on DEBUG_KERNEL
@@ -143,6 +197,7 @@ config DEBUG_BFIN_NO_KERN_HWTRACE 
config EARLY_PRINTK

	bool "Early printk" 

	default n

	select SERIAL_CORE_CONSOLE

	help

	  This option enables special console drivers which allow the kernel

	  to print messages very early in the bootup process.

arch/blackfin/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -67,6 +67,7 @@ rev-$(CONFIG_BF_REV_0_2) := 0.2 
rev-$(CONFIG_BF_REV_0_3)  := 0.3

rev-$(CONFIG_BF_REV_0_4)  := 0.4

rev-$(CONFIG_BF_REV_0_5)  := 0.5

rev-$(CONFIG_BF_REV_0_6)  := 0.6

rev-$(CONFIG_BF_REV_NONE) := none

rev-$(CONFIG_BF_REV_ANY)  := any

arch/blackfin/configs/BF526-EZBRD_defconfig

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