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Raspberry Pi 2 JTAG error on memory access

Alessandro

Hi all,

I am trying to connect to the RPi2 JTAG.

I have the following setup

- Raspberry Pi 2 running Raspbian 8.0 (Jessie)

- OpenOCD 0.9.0 with a J-Link EDU connected to a Ubuntu system.

I setup the GPIO in order to expose the JTAG interface and the JTAG connection works: I can halt/resume processors.

The issues start whenever I tried to access the memory (with the CPU halted).

For example

> halt                                
ttbcr 0ttbr0 378a806attbr1 406a
rpi2.cpu.3 rev 5, partnum c07, arch f, variant 0, implementor 41
number of cache level 2
cache l2 present :not supported
rpi2.cpu.3 cluster f core 3 multi core
target state: halted
target halted in ARM state due to debug-request, current mode: Supervisor
cpsr: 0x60000093 pc: 0x80021868
MMU: enabled, D-Cache: enabled, I-Cache: enabled

> dump_image ram.bin 0x08000 0x1000
timeout waiting for DSCR bit change
in procedure 'cache_config'

Is there anyone aware of this issue?

Is there anything I can do to dig into the problem? I was thinking about disabling the cache...

Any help would be appreciated.

Best

Alex

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