I have a query about the following:
pin_func = 0;
/* not valid for 1550 */
// 2nd USB port is USB device
pin_func = au_readl(SYS_PINFUNC) & (u32)(~0x8000);
Now SYS_PINFUNC is defined as 0xB190002C
the (u32)(~0x8000) means 0xB190002C & 0xFFFF1FFF right?
Then the original value of SYS_PINFUNC remains unchanged..so what is the
purpose of the above code?
On Wed, 2006-08-02 at 15:00 +0530, Mayuresh Chitale wrote:
> Hi Ashlesha,
> The kernel starts from head.S. This present for each architechture.
> E.g for mips there is arch/mips/kernel/head.S. There it does some very
> low level init and jumps to start_kernel which is defined in
> init/main.c. You can browse the code in start_kernel to understand how
> system init is done.
> You could compare your new bsp with some existing bsp in the source
> and see the code flow for that starting with start_kernel. Tracing the
> same path for your bsp should work.
> On 8/2/06, Ashlesha Shintre <email@example.com> wrote:
> > Hi Mayuresh,
> > I was wondering if you could point me in the right direction with
> > respect to writing the board support software for the Ampro EncoreM3
> > board.
> > So far, I looked at the websites you suggested and got as far as
> > configuring the kernel. I am still stuck with respect to the order of
> > system initialisation in the 2.6 kernel. By my understanding in the 2.4
> > kernel, following is the order:
> > 1) Setting up interrupt tables
> > 2) Activating the Timer Interrupt
> > 3) Initialising the console and memory data structures etc.
> > I have available the 2.4 bsp code available, but do not understand,
> > where the kernel starts-- is it the init.c file from the encm3 directory
> > or is it the generic linux/init/init.c file? Neither have the main()
> > function defined in them!
> > I really appreciate your help,
> > Thank you,
> > Ashlesha.