Le 15/02/2011 09:21, Ran a écrit :
Albert ARIBAUD<albert.aribaud<at> free.fr> writes:
Hi Ran,
Le 15/02/2011 07:35, Ran Shalit a écrit :
Hello,
I'm working on OMAPL138 EVM board, with the U-BOOT. I'm trying to access and write into the register (which have write bits), but I always read 0 in all the map space of the mcBSP0 and mcBSP1. (0x01d10000 - 0x1d10800, 0x01d11000 - 0x1d11800). I wonder what I missed here. any ideas are welcomed.
Many SoCs have "base address registers" that allow remapping internal or peripheral registers anywhere in the address space, which means the actual address you're trying to get at might not be the right one. Did you check the BAR(s) and make sure the mcBsp address you're targetting is the right one for your board?
Thank you very much,
Ran
Amicalement,
Hello Albert,
Thank you very much for your reply. I've checked the datasheet but I see no reference to base address registers for the mcBSP.
mcBSP: http://www.ti.com/litv/pdf/sprugj6c OMAPL138: http://www.ti.com/lit/gpn/omap-l138
Evidently the mcBsp specs won't tell you how the device is mapped within a given SoC. As for the OMAPL138 SoC, it looks more like an overview. You would need to refer to a detailed spec, one with register level description of the module.
thanks again,
Ran
Amicalement,