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J-Link on AT91SAM9263-ek

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knopf

Beginner

Date of registration: Jun 16th 2009

Posts: 2

1

Tuesday, June 16th 2009, 2:52am

J-Link on AT91SAM9263-ek

Hi.

I have quite a number of frustrating experiences with the SAM-ICE here with the AT91SAM9263-ek.

1) 4.06b does not recognize the board when I want to use J-Mem. The error message is "SAM-ICE can only be used with ATMEL devices". Ha! I have one. Older versions have the same problem.

2) 4.07b recognizes the board in J-Mem, but it shows all blank (--------). It correctly reads past 0xE0000000, but that's not good enough. I don't know how I can read the memory below that address?

3) j-link itself works. I can connect and dump the registers. If I call 'mem 0x0, 0x32', it says "Could not read memory". Again, it can read it beyond 0xe0000000.

Is there any way to get that thing to work, or did I simply buy a blue piece of plastic? :cursing:

Thanks a lot,
Kasi


-----

SEGGER J-Link Commander V4.07b ('?' for help)
Compiled Jun 10 2009 19:56:38
DLL version V4.07b, compiled Jun 10 2009 19:56:22
Firmware: J-Link ARM V8 compiled May 27 2009 17:31:22
Hardware: V8.00
S/N : 28000905
OEM : SAM-ICE
Feature(s) : RDI
VTarget = 3.267V
Info: TotalIRLen = 4, IRPrint = 0x01
Info: CP15.0.0: 0x41069265: ARM, Architecure 5TEJ
Info: CP15.0.1: 0x1D152152: ICache: 16kB (4*128*32), DCache: 16kB (4*128*32)
Info: Cache type: Separate, Write-back, Format C (WT supported)
Found 1 JTAG device, Total IRLen = 4:
#0 Id: 0x0792603F, IRLen: 4, IRPrint: 0x0 ARM926EJ-S Core
Found ARM with core Id 0x0792603F (ARM9)
ETM V1.3: 4 pairs addr.comp, 2 data comp, 8 MM decs, 2 counters, sequencer
JTAG speed: 5 kHz
J-Link>halt
PC: (R15) = FFFF0028, CPSR = 600000D7 (ABORT mode, ARM FIQ dis. IRQ dis.)
R0 = 00000000, R1 = 600000D7, R2 = 00000000, R3 = FE07F458
R4 = E3FE9960, R5 = 00000000, R6 = E3FE9960, R7 = 00000000
USR: R8 =00000000, R9 =00000000, R10=00000000, R11 =E3FFDFC8, R12 =FC4046AC
R13=E3C95420, R14=FE063E7C
FIQ: R8 =A531607C, R9 =AED6B312, R10=04C008C0, R11 =6600A54C, R12 =3E2B41F9
R13=FE07D458, R14=CE2F1BFC, SPSR=00000010
SVC: R13=E3FFDFBC, R14=FE0565F4, SPSR=6000001F
ABT: R13=FE07D438, R14=FFFF010C, SPSR=600000DF
IRQ: R13=FE07D448, R14=FC4046BC, SPSR=60000013
UND: R13=FE07D428, R14=00000008, SPSR=00000010
J-Link>mem 0x0,0x2
Could not read memory.
J-Link>

SEGGER - Alex

Super Moderator

Date of registration: Dec 18th 2007

Posts: 299

2

Thursday, June 25th 2009, 2:51pm

Hello Kasi,

>>1) 4.06b does not recognize the board when I want to use J-Mem. The error message is "SAM-ICE can only be used with ATMEL devices". Ha! I have one. Older versions have the same problem.
This problem was caused by the MMU (if it is enabled) of the AT91SAM9263 which made it impossible for J-Link to identify that the target is a AT91SAM9263 which can definitely used with SAM-ICE.
This problem is fixed since V4.07b

>>2) 4.07b recognizes the board in J-Mem, but it shows all blank (--------). It correctly reads past 0xE0000000, but that's not good enough. I don't know how I can read the memory below that address?
>>3) j-link itself works. I can connect and dump the registers. If I call 'mem 0x0, 0x32', it says "Could not read memory". Again, it can read it beyond 0xe0000000.
I have tested this with the current beta version (V4.07g) and do not see any problems.
I have also tested this with V4.06b and do not see any problems.
Could you please ensure that memory is available at addr 0x0 (maybe the MMU mapped the memory at addr 0x0 to another location)
When I performed my tests the MMU was disabled so memory was available at addr 0x0

Best regards
Alex

knopf

Beginner

Date of registration: Jun 16th 2009

Posts: 2

3

Monday, June 29th 2009, 6:21pm

Hello Alex,

I didn't know that the JTAG memory commands pass through the MMU. Indeed when I consider the MMU mappings, it seems to work. Is there a to directly access memory, e.g., the hardware mapped registers of the PIO controllers (e.g., 0xFFFFFXXX), without going through the MMU? I can't disable the MMU, since I'm running an OS that requires it when I want to read out the memory.

Thanks,
Kasi

SEGGER - Alex

Super Moderator

Date of registration: Dec 18th 2007

Posts: 299

4

Thursday, July 2nd 2009, 8:51am

Hello Kasi,

>>Is there a to directly access memory, e.g., the hardware mapped registers of the PIO controllers (e.g., 0xFFFFFXXX), without going through the MMU?
No, all memory accesses go through the MMU. Do you see a problem in leaving the registers you want to read, at their original address?


Best regards
Alex

franke.m

Beginner

Date of registration: Mar 5th 2010

Posts: 3

5

Wednesday, April 28th 2010, 2:21pm

Accessing hardware mapped registers through JLink/SAM-ICE

Hello,

I just stumbled across the same problem.

after booting Linux I want to read hardware mapped registers like the PIO registers via JLink/SAM-ICE on my AT9261 based board.
However I can only access the parts which are available through the mmu.

But there must be a way to access the physical memory addresses.....I mean....this is supposed to be the big advantage of using an emulator like the SAM-ICE.

Any ideas?

Markus Franke

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