Re: AW: [ixp1200] SDK 2.0, IXA and Kernel on eval board?

[Mirko Benz]

James,

The Linux version from netwinder (INTEL) was intended for the IXP12EB and
SDK 1.x. SDK 2 Linux adds IXP system configuration support in the Linux
kernel the rest of the distribution seems to be se same. However, it is not
intended for IXP12EB.

To get it running on the evaluation board (as add in card):

Select eval board during linux config

arm/kernel/bios32.c
	IXP PCI bug issues
arm/kernel/entry-armv.S
	added IRQ_DOORBELLHOST, DMA irq
arm/kernel/ixp1200.c
	ixp1200_pci_init() PCI bug workaround
include/asm-arm/arch-ixp1200/irq.h
	add doorbell irq to irq_reg[]
	modify irq_mask[]
include/asm-arm/arch-ixp1200/irq.h
	more irq stuff: NR_IRQS, define IRQ_DOORBELLHOST
include/asm-arm/arch-ixp1200/ixp1200eb.h
	change IXP1200_IRQS
	#define PHYS_SDRAM_BASE       0xC0C00000
arch/arm/boot/compressed/Makefile
	ZTEXTADDR	 = 0xc0c08000

This is not necessarily complete - just what I remember.

zImage start address: C0C08000
ramdisk start address: C1400000
start from cygmon: go c0c08000

If you plan to use the board standalone don’t care about PCI and IRQ stuff.
You can use cygmon ftp to put the images at the right place (or rebuild the
flash image).

Reduce the ramdisk memory footprint as much as possible (extract old ixp
binaries). Ramdisk can then be around 5,5 MB (adjust this in the linux tree
arch.c file and ramdisk build tree). Total memory for Linux is 18 MB. If
you need more memory consider mounting root via nfs.

That said, you still have to modify certain things at the SDK 2 application
layer and some drivers. It took us some time to figure that out so don't
expect everything to work first time ;-) But as you see INTEL won't help
you either.

Regards,
Mirko Benz


> On Tue, 2002-05-14 at 06:01, benz at mephisto.inf.tu-dresden.de wrote:
>> Of course it is possible to get the Linux version provided with SDK 2
>> running on the evaluation board. But it is a bit tricky because the
>> documentation is a bit week concerning board customization (e.g.
>> minimum memory requirements ...) and other "issues" (e.g. chip bugs).
>>
>> We have done that and it works for us. There are certainly limitations
>> in that you can not run SDK 2 apps requiring C0 silicon or apps
>> requiring more than 1K control memory storage. You will also have to
>> reduce the table sizes due to memory limitations in some cases. But
>> for a development system this is often tolerable.
>
> Hi!
>
> I wonder if you could give me any insight into what you had to do to
> boot Linux on the B0 board? I tried building my own from the
> intel-supplied sources, with no luck. The kernel available from the
> netwinder guys doesn't seem to support the necessary intel calls.
>
> Thanks!
>
> - James



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