From: slash.tmp@free•fr (Mason)
To: linux-arm-kernel@lists•infradead.org
Subject: Steps to submit a new arch/arm port
Date: Fri, 25 Sep 2015 15:35:36 +0200 [thread overview]
Message-ID: <56054DA8.4050903@free.fr> (raw)
In-Reply-To: <2210529.vnGEGUl8Dr@wuerfel>
On 25/09/2015 15:17, Arnd Bergmann wrote:
> On Friday 25 September 2015 15:06:32 Mason wrote:
>> On 22/09/2015 16:51, Arnd Bergmann wrote:
>>
>>> Move this to the platform Kconfig file. Also, drop all the
>>> 'select' statements that are implied by ARCH_MULTIPLATFORM
>>> and ARCH_MULTI_V7
>>
>> I've trimmed my platform Kconfig down to:
>>
>> config ARCH_TANGO4
>> bool "Sigma Designs Tango4 (SMP87xx)"
>> default y
>
> drop the default
>
> add
> depends on CPU_MULTI_V7
I've done this higher up.
menuconfig ARCH_TANGOX
bool "Sigma Designs Tango" if ARCH_MULTI_V7
help
something useful
if ARCH_TANGOX
config ARCH_TANGO4
...
endif
So 'default y' enables ARCH_TANGO4 only if ARCH_TANGOX is selected,
right?
>> select ARCH_HAS_HOLES_MEMORYMODEL
>> select ARM_ERRATA_754322
>> select ARM_ERRATA_764369
>
> add 'if SMP'
>
>> select ARM_GIC
>> select CACHE_L2X0
>
> remove CACHE_L2X0, we want to be able to turn this off.
Some people run with L2 disabled? That's a strange thing to do.
>> select CLKSRC_MMIO
>> select GENERIC_IRQ_CHIP
>> select HAVE_ARM_SCU
>> select HAVE_ARM_TWD
>
> 'if SMP'
>
>> select NEON
>> select SMP
>
> These should be user-selectable as well, so drop the 'select'
> and make sure the kernel builds with them turned off.
It will build, but it won't run! My port uses the TWD for clockevents,
and smp_twd.c is only compiled if HAVE_ARM_TWD. So I must set SMP.
>> Didn't find much documentation on ARCH_HAS_HOLES_MEMORYMODEL.
>> What is it used for?
>
> You need this if the RAM is not physically contiguous, e.g. 256MB at one
> address and another 256MB somewhere else.
>
>> Is it OK to select CACHE_L2X0, NEON, and SMP?
>
> no
Then I have a major problem... my port requires SMP.
Regards.
next prev parent reply other threads:[~2015-09-25 13:35 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-21 15:00 Steps to submit a new arch/arm port Mason
2015-09-21 15:49 ` Arnd Bergmann
2015-09-22 14:36 ` Mason
2015-09-22 14:51 ` Arnd Bergmann
2015-09-22 14:56 ` Russell King - ARM Linux
2015-09-22 15:54 ` Mason
2015-09-22 16:29 ` Russell King - ARM Linux
2015-09-23 8:49 ` Mason
2015-09-23 9:13 ` Russell King - ARM Linux
2015-09-23 9:21 ` Mason
2015-09-23 9:26 ` Russell King - ARM Linux
2015-09-22 19:15 ` Arnd Bergmann
2015-09-23 9:26 ` Mason
2015-09-23 9:34 ` Arnd Bergmann
2015-09-25 13:06 ` Mason
2015-09-25 13:17 ` Arnd Bergmann
2015-09-25 13:35 ` Mason [this message]
2015-09-25 14:11 ` Arnd Bergmann
2015-09-25 15:28 ` Mason
2015-09-25 15:33 ` Mason
2015-09-25 15:49 ` Arnd Bergmann
2015-09-25 15:52 ` Arnd Bergmann
2015-09-25 16:09 ` Mason
2015-09-25 17:20 ` Arnd Bergmann
2015-09-28 13:48 ` Mason
2015-09-28 14:43 ` Måns Rullgård
2015-09-28 16:32 ` Mason
2015-09-28 17:29 ` Russell King - ARM Linux
2015-09-22 15:48 ` Måns Rullgård
2015-09-25 9:27 ` Mason
2015-09-25 9:46 ` Javier Martinez Canillas
2015-09-25 11:56 ` Arnd Bergmann
2015-09-25 12:06 ` Russell King - ARM Linux
2015-09-21 15:51 ` Måns Rullgård
2015-09-21 16:13 ` Russell King - ARM Linux
2015-09-22 16:08 ` Mason
2015-09-22 16:24 ` Russell King - ARM Linux
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