DM6467T HPI boot problem

longxiao zhang

Hi,

There are some issues with HPI boot mode of DM6467T from my custom board.

In spraas0 “Using the TMS320DM646x DMSoc Bootloader”, it says we should let the host “Sent ACK to Device” at the very beginning, otherwise the CPU will go into UART-Boot Mode. Here I don’t know what “ACK” exactly means.

I tried to write 1 to the HINT bit of HPIC register. It didn’t work, and CPU just fell into UART-Boot Mode . I also tried to write 1 to the DSPINT bit of HPIC register, after writing HINT bit. The result was same.

Anyway, I also found the period CPU wait for “ACK” is 5 seconds, not 50 seconds as the doc says. Surprisingly, I do the experiment on EVM6467, the period seems to be 50 seconds.

In all, my questions are:

1. How to “ACK” CPU?

2. Are there any other different between the RBL of DM6467 and DM6467T, besides the period?

Any help will be highly appreciated!

zhang

over 12 years ago

0 Ning Wang10298 over 12 years ago

Intellectual 395 points

you actually need to clear the HINT bits to prevent additional trigger for your host, and you need to INTERRUPT 6467 by writing DSPINT, This is actually 'ACK' means, and i believe it is stated in the document.

0 longxiao zhang over 12 years ago in reply to Ning Wang10298

Intellectual 500 points

Hi Wang,

It looks like I did the right thing, umhh...? But the CPU fell into UART bootmode anyway. Or Did I miss something else?

And I'm using a JTAG to debug the CPU. Does it matter? For the UART pins are float, I must judge which stage RBL is at by looking at the PC register.

Zhang

0 longxiao zhang over 12 years ago in reply to Ning Wang10298

Intellectual 500 points

Hi Wang,

I figured out what’s wrong.

I have been using a FPGA to simulate the HPI timing. There was a mistake I made there. HCNTL[0:1] were not both drove low. So I didn’t manage to access the HPIC register at all.

And, the period DM6467T wait for BC in BOOTSTAT is 5 seconds, which I also think is not long enough. But DM6467 does have a longer period of 50 seconds, as they state.

Thank you for the help.

0 Ning Wang10298 over 12 years ago in reply to longxiao zhang

Intellectual 395 points

Yes, the period is too short for us to ACK the slave in Linux.... sad.

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DM6467T HPI boot problem