Endianness: emulator won't load 'Invalid endianness'

Richard Hutchings

Hello

We're trying to bring up a new PCB with the C6472 mounted on the board. I'm using a Spectrum Digital XDS510 USB 'Plus'.

We're supposedly using little endian mode, relying on the weak pullup on the line LENDIAN (i.e. that pin is not connected to anything). The software is compiled in little-endian, and works fine on the 6472 EVM. On attempting to download software to the new PCB's C6472, I get an error no-one has ever seen, stating it 'Failed to load program' reason 'Invalid endianness'.

The emulator is however attached, so I've looked at register DEVSTAT (0x02a80000), and the value read back on two different power cycles is ( in Hex 8-bit TI style) 00 79 01 08. A diffrent power cycle read 00 61 00 08.

So my question: what is the interpretation of this value? Should I read it as the byte in DEVSTAT containing LENDIAN, DDREN and BootMode is 00 or 08? I guess 00, which means there's a big problem, as the thing is meant to be wired for BootMode (binary) 0001 - Host boot over HPI.

Sorry to appear ignorant, the one thing that does me in consistently is endianness.

Thanks

Richard

over 14 years ago

0 NARESH PATEL over 14 years ago

Intellectual 325 points

Hi Richard,

Have you any user switch to set endian either little endien or big endien in your EVM. If you have compiled code for little endien and set user switch setting in big endien then such type of error found. I got such type of error in previous.

Thanks.

Naresh

0 NARESH PATEL over 14 years ago

Intellectual 325 points

Hi Richard,

Have you any user switch to set endian either little endien or big endien in your EVM ? If you have compiled code for little endien and set user switch setting in big endien then such type of error found. I got such type of error in previous.

Thanks.

Naresh

0 Richard Hutchings over 14 years ago in reply to NARESH PATEL

Prodigy 190 points

Hi Naresh

Thanks very much for taking the time to read and respond to my query. We have resolved it - turned out to be a power sequencing issue so that the pins were being read before they were (properly) powered up. The DSP then thought it was in big-endian...

Regards

Richard

0 Aditya over 14 years ago in reply to Richard Hutchings

TI__Expert 6815 points

Hi Richard, glad to know you found the cause. Can you please click the "verify answer" button so that we can mark this thread as fixed.

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Endianness: emulator won't load 'Invalid endianness'