[ts-7000] Accessing 16-bit device over PC104 on TS7800

[Tom Panzarella <>]

Hello,

I am having problems trying to access a 16-bit PC104 card,  
specifically a Sensoray Model 526, using a TS7800. The Sensoray is  
"controlled through a set of 27 registers mapped into I/O space ...  
all register accesses are 16-bit; 1 byte and odd addresses are not  
supported" (from Sensoray 526 manual). I first discovered my problems  
trying to access this board while writing a kernel driver for it where  
the data I was expecting to find did not seem correct. So I am now  
troubleshooting my access using `peekpoke' on the command line.

The Sensoray board has it's base address set to 0x2C0 (via a set of  
jumpers) and has a "signature register" located at address 0x34 where  
I expect to see: 0x526X (where X = firmware revision number) after a  
16-bit read. So, what I am doing is this:

# peekpoke 16 0xEF0002F4

NOTE: The address of 0xEF0002F4 is derived by: 0xEF000000 + 0x2C0 + 0x34
NOTE2: Per the TS7800 manual 
(http://www.embeddedarm.com/about/resource.php?item=303#pc104bus 
) 16-bit I/O base address is 0xEF000000.

Prior to trying to access the Sensoray board, I do the following:

# pc104on

And I verify the following via `peekpoke':

# peekpoke 32 0xE8000030
0x55555555
# peekpoke 32 0xE8000034
0x55555555
# peekpoke 32 0xE8000038
0x55555
# peekpoke 32 0xE800003C
0x55555

Also NOTE that on the Sensoray message forum, with respect to another  
one of their peripherals, I read a post from a Sensoray engineer who  
stated that SBCs that perform 16-bit data transfers as two consecutive  
8-bit accesses will not work: 
http://www.sensoray.com/forum/viewtopic.php?t=10&highlight=isa
Is this the case with the TS7800?

For the record, this particular TS7800 has been used with 8-bit PC104  
cards successfully.

Any other pointers from the list members or TS tech support is greatly  
appreciated.

Thanks,
Tom.



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