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Subject: Re: Problem reading and programming memory location...
From: neorf3k <neorf3k@gmail.com>
In-Reply-To: <20131113083259.1b69ed18@crub>
Date: Wed, 13 Nov 2013 14:48:24 +0100
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References: <985685C7-0122-4D45-96D1-4412E9774A5D@gmail.com>
 <20131113083259.1b69ed18@crub>
To: Anatolij Gustschin <agust@denx.de>
Cc: Linux Ppc Dev List Dev List <linuxppc-dev@lists.ozlabs.org>
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Yes, that is a device on the lpb via an fpga. We  have tried to =
configure the chip select 4 configuration register at address MBAR + =
0x0310, and it seems to be ok. what do you mean with =93chip select =
parameters=94?
We have been able to edit it in U-BOOT, and the board (that chip) now =
works=85
The strange thing, is that when we read in linux, at that address, we =
see other content value=85
Suggestions?

Thanks

Lorenzo

On 13/nov/2013, at 08:32 AM, Anatolij Gustschin <agust@denx.de> wrote:

> On Tue, 12 Nov 2013 20:23:20 +0100
> neorf3k <neorf3k@gmail.com> wrote:
>=20
>> we have tried to read and program an 8bit register with 32bit =
address.
>> we have mapped it with: ioremap, kmalloc etc=85 and then using: outb,
>> iowrite8 etc.. but when we write to it, the value doesn=92t change=85
>> with other memory location is ok.
>> That is an 8 bit register, located at 0x10020000 in a mpc5200b
>> architecture. we are using kernel 2.6.33.=20
>> what could be?
>=20
> 0x10020000 is not in the internal register memory map, so it
> is probably a device on the LocalPlus bus. Did you configure
> the chip select parameters for this device and did you enable
> the associated chip select?
>=20
> HTH,
>=20
> Anatolij
>=20