Process 32-bit data without endianess-conversion between ARM – DSP?

Process 32-bit data without endianess-conversion between ARM – DSP?

[Liem Pham Tan]

Hi All,
I’m using DSP/BIOS LINK 1.10.1 to communicate between ARM and DSP on 
OMAP5912.
I need to process 32-bit data on both ARM and DSP. The problem is DSP 
uses big-endian and ARM uses little-endian.
The application note “Using Endianess Conversion in the OMAP5912 device” 
(SWPA027) stated that :  if both MPU and DSP access the data using the 
same access size, then no endianess conversion is needed.
But when I pass data between them, the DSP always perform an 
word-endianess conversion (16-bit). For example : If I write 0x00000001 
on GPP and send via DSP/BIOS LINK to DSP, the data on DSP will be read 
0x00010000 (and vice versa). I used Int32 on GPP and long on DSP 
(32-bit) to access the buffer.
The DSP endianess can be controlled by the DSP MMU endianess control 
register, but I can’t find any good way to set this register in DSP/BIOS 
LINK ( I did try to set the channel attribute to ChannelDataSize_32bits* 
*but it didn’t work).
Do you have any ideas on this problem?
Best regards,
Liem Pham