Subject: RE: How to port NetBSD to a new platform with OMAP 1610
To: , <port-arm@NetBSD.org>
From: None <Lin.Colin@iac.com.tw>
Date: 03/26/2004 17:39:20
Please see below...
From: Charles M. Hannum [mailto:email@example.com]=20
Sent: Friday, March 26, 2004 2:39 AM
To: Lin, Colin(=AAL=AB=D8=A6w IAC)
Subject: Re: How to port NetBSD to a new platform with OMAP 1610
> On Thursday 25 March 2004 09:47 am, Lin.Colin@iac.com.tw wrote:
> > I am currently working on porting NetBSD to OMAP 1610.
> > Not familiar with NetBSD before, I had paid a lot of time on =
> > I found that NetBSD already supports ARM9 core (ARM920T), and OMAP =
> > belongs to ARM926.
> I've ported NetBSD to the DM310, which is similar. (Unfortunately I =
> release that code.)
> > Many questions needed to be solved:
> > 1. What=A1=A6s difference between ARM920T and ARM926? Does the =
> > ARM920T run well on ARM926 without any modifying?
> There is very little difference in the ARM core itself. However, =
> *else* is different. In particular, you will have to implement custom =
> interrupt routing for the OMAP processor. (I think it's different on =
What does "everything" mean? Does it mean "device drivers", and =
interrupts for device drivers are therefore different?
> > 2. Dram and NOR Flash have been set up in U-BOOT. Need the =
> > it again in the beginning?
> No; if you've already set up the clocking and initialized the RAM, you =
> need to do it again -- though it doesn't hurt.
That's great for me.
> > 3. =A1=A7KERNEL_BASE_PHYS=A1=A8 is used to set up the load =
place of the kernel,
> > and what=A1=A6s =A1=A7KERNEL_BASE_VIRT=A1=A8?
> The kernel maps itself (and is therefore linked) at a different =
> the physical address it's loaded at.
Why we want to map kernel to a higher virtual address?
Is it that lower virtual address is used by applications?
Can I change this virtual address as me pleases?
Thanks and regards