Can't capture Vps_printf messages to file

I'm trying to debug the EZSDK media controller binaries, but I can't get any output from them. Attaching a serial interface is not an option due to the way our design has been laid out.

I've tried to use

/usr/remote_debug_client 0xBF900000 &

for my 1GB design that uses the normal DM8168 memory map but I don't get anything useful. Here is the output:

[c6xdsp ] Remote Debug Shared Memory @ 0xbf900000
[m3video] Remote Debug Shared Memory @ 0xbf905020
[m3vpss ] Remote Debug Shared Memory @ 0xbf90a040
notify_shm_drv_sendevent failed! status = 0xfffffff0
notify_send_event failed! status = 0xfffffff0

notify_shm_drv_sendevent failed! status = 0xfffffff0
notify_send_event failed! status = 0xfffffff0
notify_shm_drv_sendevent failed! status = 0xfffffff0
notify_send_event failed! status = 0xfffffff0

etc

I've also tried these memory addresses in case they work, but they give no output at all:

 0xBFB00000
 0xBFD00000
 0xBFF00000
 0xC0000000

Incidentally, loggerSMDump.out works fine for debugging the OpenMAX side of the MC.

Thanks,
Ralph