[PATCH] mtd: maps: lantiq-flash: Check if the EBU endianness swap is enabled

[John Crispin]

On 18/01/2017 14:48, Seb wrote:
> Hi John,
> 
> 
>>>
>>>       ltq_mtd->map->map_priv_1 = LTQ_NOR_PROBING;
>>
>> this line should be dropped
> 
> Yes, I noticed this mistake. I fixed it but forgotten to add thix fix
> to my commit -_-
> 
>>> +     /* We swap the addresses only if the EBU endianness swap is disabled */
>>> +     if (ltq_ebu_r32(LTQ_EBU_BUSCON0) & BIT(30))
>>
>> add a define for BIT(30) please and we should really check if this a
>> v1.2 or newer. if my memory is correct this was a silicon bug inside
>> v1.0 and v1.1
> 
> In my kernel (OpenWrt) boot log I have :
> 
> [    0.000000] Linux version 4.4.14 (qa at serveurQA) (gcc version 5.3.0
> (OpenWrt GCC 5.3.0 50020) ) #150 SMP Tue Jan 17 09:18:24 UTC 2017
> [    0.000000] SoC: xRX200 rev 1.2
> [    0.000000] bootconsole [early0] enabled
> [    0.000000] CPU0 revision is: 00019556 (MIPS 34Kc)
> 
> It would be better to ensure that the SoC version is >= 1.2 (as this
> bug was fixed in this version).

the bug is also fixed on the 300 and 500 series chips, so we would want
to check for that aswell.

	John




> You can get more informations in my OpenWrt pull request :
> 
> https://github.com/openwrt/openwrt/pull/321
> 
> 
> Regards,
> 
> Sebastien.
>