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uClinux can not be halted with OpenOCD

Hi all,
I have a setup on ARM946E that works well for loading and booting
uClinux, and during the boot phase I can stop and single-step kernel.

But once booted, when it gives prompt, pressing CTRL-C in GDB can not
halt the board :

^CHalt timed out, wake up GDB.

Program received signal SIGINT, Interrupt.
stext () at arch/arm/kernel/head-nommu.S:40
40              ldr     r1, =machine_arch_type
                @ find the machine type

And messages from OpenOCD are these :

Info : Halt timed out, wake up GDB.
Warn : target not halted
Warn : ThumbEE -- incomplete support

Do you have any ideas what is happening ? I suspected on low-power
mode, but uClinux does not enter it (I think).

Best regards,

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