Re: [PATCH v1 1/3] powerpc, 8xx: remove support for 8xx

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Re: [PATCH v1 1/3] powerpc, 8xx: remove support for 8xx

LEROY Christophe


Le 13/06/2017 à 09:37, Heiko Schocher a écrit :

> Hello Christophe,
>
> Am 13.06.2017 um 07:40 schrieb Christophe LEROY:
>>
>>
>> Le 13/06/2017 à 07:26, Christophe LEROY a écrit :
>>> There was for long time no activity in the 8xx area.
>>> We need to go further and convert to Kconfig, but it
>>> turned out, nobody is interested anymore in 8xx,
>>> so remove it (with a heavy heart, knowing that I remove
>>> here the root of U-Boot).
>>>
>>> Signed-off-by: Heiko Schocher <[hidden email]>
>>>
>>
>> Please don't do that.
>
> Tom already applied the patch to mainline ...

Can be reverted ?

>
>> As you can see in Linux kernel activity, there have been a lot
>> activity related to the 8xx,
>> including but not limited to:
>> 1/ HW Crypto for the 885 (Talitos SEC1)
>> 2/ TX NAPI in the 8xx Ethernet driver
>> 3/ Scatter/Gather support in the 8xx Ethernet driver
>> 4/ Hugepages
>> 5/ Perf events
>> 6/ hw breakpoints
>> 7/ Linear memory mapping via Large TLBs
>
> Thats linux ... not u-boot!

Sure, but it shows there is still interest to that processor. The 885 is
a good recent 8xx.
u-boot is not really something we focus on. We update it once a year, as
far as it can start our Linux box we are happy.

>
>> The followings links give an overview of the activity:
>>
>> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/log/drivers/crypto/talitos.c 
>>
>> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/log/drivers/net/ethernet/freescale/fs_enet/fs_enet-main.c 
>>
>>
>> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/log/arch/powerpc/kernel/head_8xx.S 
>>
>>
>> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/log/arch/powerpc/mm/8xx_mmu.c 
>>
>>
>> We have thousands of boards with mpc885 running and requiring support
>> for at least the next 10 years.
>
> Ok, nice to hear!
>
>> How can the 8xx survive without U-boot support ?
>
> Tom asked (I think a lot of times) regarding converting mpc8xx to
> Kconfig / DM and nobody did the necessary steps. We also asked
> our customers if they can do the necessary changes, none was interested.

I did't know. Indeed I was not following uboot activity until someone
who knows the level of interest we have in 8xx alerted me yesterday.
It would have been nice if you had notified linuxppc-dev list.

>
> So, if you need mpc8xx support in U-Boot, simply add it again with
> Kconfig and DM support included!

Ok, I'll try and come with a patch to convert 8xx in the coming weeks.
In the mean time please revert the deletion in order to avoid nightmare
conflicts when the converting patch comes.

Thanks
Christophe