Re: iProc nand iproc-idm register

[Hauke Mehrtens <hauke@hauke-m.de>]

On 05/25/2015 07:00 PM, Ray Jui wrote:
> Hi Hauke,
> 
> On 5/24/2015 10:16 AM, Hauke Mehrtens wrote:
>> Hi Ray,
>>
>> in the iproc_nand driver your are using this register range:
>> reg = <0x18046000 0x600>, <0xf8105408 0x600>, <0x18046f00 0x20>;
>> reg-names = "nand", "iproc-idm", "iproc-ext";
>>
>> I think the iproc-idm register range is the wrap address part on bcma
>> bus. On the bcma bus it is 0x1000 in size and 0x0408 is the offset of
>> the IO control register in it. Are the new iProc devices different here
>> or is this register not always at this offset but varies?
> 
> It's different. Based on the Cygnus RDB, there's nothing between
> 0xf8105000 and 0xf8105404.

Thanks for the info, the space before 408 is not used on the older
chips, just some addresses ontop of that.

Still this is a strange address to start a register map.

> 
>>
>> Wouldn't it be better to specify the complete range like this:
>> reg = <0x18046000 0x600>, <0xf8105000 0x1000>, <0x18046f00 0x20>;
>> Then you can read the register at offset 0x408 in that range.
>>
>> Hauke
>>