[ECOS] IXP435 usb register access issue (Fount it)

mukund jampala mukund.redboot@gmail.com
Thu Feb 26 20:34:00 GMT 2009


Hi Andrew,

Found the problem.

Thanks for replying.
I did modify the code in the hal_platform_setup.h
hal/arm/xscale/kixrp435/current/include/hal_platform_setup.h
        IXP_MAP_IO      0xCD000000, 0x01000000
        IXP_MAP_IO      0xCE000000, 0x01000000

and printed out the dereferences vale at 0xCD000000.
It is working if I load the image into the flash(RAMROM). It is NOT
work properly when I try to use th RAM image.

After build the respective RAMROM or RAM images, this is what I am doing.

RAMROM image load procedure:
RedBoot>load -r -b 0x01000000 redboot.bin
RedBoot>fis write -b 0x01000000 -l 0x80000 -f 0x50000000
With it Works. I am able to access the USB registers

RAM image load procedure:
RedBoot>load -v redboot.bin
RedBoot>go -w 1

Intersting part is here: (latest findings)
If the underlying ROM image is older(what I got with board) than what
I use, the newly build RAM image is NOT able to acces the 0xCD000000
registers.
If the underlying ROM image is new (I reflashed with above RAMROM
procedure), the newly build RAM image is able to acces the 0xCD000000
registers.

Not sure, but looks to me like the MMU tables in RAM image are not
being used when the RAM image is executing. Instead it is pulling out
the ROM image MMU tables.
Do you know anything about why this is happening?

- Mukund Jampala



On Tue, Feb 24, 2009 at 11:03 PM, Andrew Lunn <andrew@lunn.ch> wrote:
> On Tue, Feb 24, 2009 at 04:25:46PM -0800, mukund jampala wrote:
>> Hi Guys,
>>
>> I am using an IXP435 and trying to program the USB controller on it.
>> The environment is Redboot.
>> In the current redboot, I am NOT able to access the USB base address
>> i.e. 0xCD000000.
>>
>> Actually, I am not able to access any address beyond 0xC80FFFE0.
>> Is there any ixp initialization or redboot initialization that I have
>> to access this registers space.
>
> Sure, look at the code which sets up the MMU. It is in the HAL for
> your target.
>
>     Andrew
>

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