Re: how to use TLB to prevent Linux accessing a particular memory region

2007-10-19 Thread Jim Brooks
> Out of 32MB of DDR 8MB is reserved for use by DSP > processor. But the MIPS processor downloads firmware > into this reserved memory for the DSP. > > Now, is it possible to use the TLB to prevent Linux > from accessing the reserved memory after the firmware > has been downloaded? Well, even if y

Re: how to use TLB to prevent Linux accessing a particular memory region

2007-10-16 Thread linux-os (Dick Johnson)
On Tue, 16 Oct 2007, veerasena reddy wrote: > Hi, > > I have a board, which has two processors ( one is MIPS > on which Linux-2.6.18 kernel runs and another is DSP > based processor) and 32MB DDR. > > Out of 32MB of DDR 8MB is reserved for use by DSP > processor. But the MIPS processor downloads

Re: how to use TLB to prevent Linux accessing a particular memory region

2007-10-16 Thread J. Scott Kasten
Really, it sounds more like you want a custom driver that "owns" that region of memory so it's marked as used and this driver is the gate keeper. I wonder if the console frame buffer driver for the mips ip32 arch might be a good example for you as it swallows a several meg chunk of memory fo

how to use TLB to prevent Linux accessing a particular memory region

2007-10-16 Thread veerasena reddy
Hi, I have a board, which has two processors ( one is MIPS on which Linux-2.6.18 kernel runs and another is DSP based processor) and 32MB DDR. Out of 32MB of DDR 8MB is reserved for use by DSP processor. But the MIPS processor downloads firmware into this reserved memory for the DSP. Now, is it