Re: [DISCUSSION] Hexagon code inside kernel

[cotulla@yandex.ua]

> š! šI did not know that. šBTW, be aware that there are usually two
> šdifferent qdsp's on there. šThe smaller/older/slower one is running
> šthe radio signal processing code and it is very locked down, as that
> šcode is considered to be extremely valuable. š(Its also the one that
> šhas total control over all the master interrupt masks, which not even
> šthe ARM can over-ride). šI'm not sure, the radio processor might not
> ševen be a qdsp6, it might be a qdsp5 or qdsp4, I never paid attention
> što that. šBut the point is: šif it seems like its locked down, make
> šsure you've got the right one, that there isn't another one sitting
> šthere on the JTAG chain.
>

It depends from QCT chipset.
In old ones ARM + QDSP4 are used for modem operations.
And QDSP5 or QDSP6 for multimedia tasks.

New ones contains 2 x QDSP6 for modem usage and 1 x QDSP6 for audio.
So actually in some chipsets there are up to 3 QDSP6 instances nowdays.

But a problem that it's heavy locked nowdays. (signature checking, hardware key + hardware crypto engine)
So it's hard task to load own code to QDSP6 :-(


So you worked primary on userland QDSP6 support?


-Cotulla