DM814x Memory Map Configuration

Danny Cullen

Deal all,

Some background first...We have a custom board using a DM814x and 256M DDR (128M @ 0x80000000 and 128M @ 0xC0000000). We're using it fior the moment for enconding only so we have both the VIPs hooked up (we're not using the TVP decoder chip).

We have a custom rootfs (based on buildroot) and we're using U-boot, Linux Kernel and board-support/component-sources features from the EZSDK v5.04.00.11 (PSP 4.04.00.01). Our version of U-boot sets up a custom pin mux arrangement etc etc.

So far, we've got through u-boot, booted the linux kernel and mounted an NFS filesystem. Now we're trying to load the firmware (dm814x_hdvicp.xem3 & dm814x_hdvpss.xem3). This seems ok and the syslink kernel modules loads ok too but I have trouble when loading the VPSS module. So my question is, after reading about the 1G and 512M versions of the HDVICP/HDVPSS firnwares, do I need to recompile the firmwares for a memory map using 128Mb DDR bank? I only want to be able to do a V4L2 capture and encode using the VPSS.

Thanks, Danny.

over 12 years ago

0 Margarita Gashova over 12 years ago

TI__Guru* 80190 points

Hello,

You could check here:

http://processors.wiki.ti.com/index.php/EZSDK_Memory_Map#Changing_Memory_map_for_256MB_board

Best Regards,

Margarita

0 Danny Cullen over 12 years ago in reply to Margarita Gashova

Intellectual 510 points

Hi Margarita,

Thanks for your reply, I've read that document and it implies that if we have an NDA signed (which we do) we can obtain the firmware sources and recompile with a bespoke memory map. I'll have to contact our TI rep to find out how we obtain the sources.

I have two further questions.

Does the memory map have to be physically contiguous?
- - We have two 128M banks (total 256M) but located at 0x80000000 and 0xC0000000. So can we use the 256M example, adjusting the addresses for our layout?
Can we shirnk the memory map further still to fit into a single 128M map, Ie. is this even possible?

Kind regards,

Danny

0 Danny Cullen over 12 years ago in reply to Danny Cullen

Intellectual 510 points

bump...anyone to confirm my questions?

Danny

0 Margarita Gashova over 12 years ago in reply to Danny Cullen

TI__Guru* 80190 points

Hello,

I am not familiar with the memory map.

Danny Cullen said:
Does the memory map have to be physically contiguous?

We have two 128M banks (total 256M) but located at 0x80000000 and 0xC0000000. So can we use the 256M example, adjusting the addresses for our layout?

You could try.

Danny Cullen said:
Can we shirnk the memory map further still to fit into a single 128M map, Ie. is this even possible?

I am not sure, but probably the answer is no.

Best Regards,

Margarita

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DM814x Memory Map Configuration