From mboxrd@z Thu Jan  1 00:00:00 1970
From: Josh Wu <josh.wu@atmel.com>
Date: Tue, 28 Jul 2015 10:17:11 +0800
Subject: [U-Boot] [PATCH v3 2/4] ARM: cache: add an empty stub function
 for invalidate/flush dcache
In-Reply-To: <55B65CE4.2090309@freescale.com>
References: <1437968418-21319-1-git-send-email-josh.wu@atmel.com>
 <1437968418-21319-3-git-send-email-josh.wu@atmel.com>
 <55B65CE4.2090309@freescale.com>
Message-ID: <55B6E627.9080508@atmel.com>
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Hi, York

On 7/28/2015 12:31 AM, York Sun wrote:
>
> On 07/26/2015 08:40 PM, Josh Wu wrote:
>> Since some driver like ohci, lcd used dcache functions. But some ARM
>> cpu don't implement the invalidate_dcache_range()/flush_dcache_range()
>> functions.
>>
>> To avoid compiling errors this patch adds an weak empty stub function
>> for all ARM cpu in arch/arm/lib/cache.c.
>> And ARM cpu still can implemnt its own cache functions on the cpu folder.
>>
>> Signed-off-by: Josh Wu <josh.wu@atmel.com>
>> ---
>>
>> Changes in v3:
>> - remove the same functions in the cpu/ files as they will use the weak
>>    function provided in lib/cache.c
>>
>> Changes in v2:
>> - new added.
>>
> <snip>
>
>> diff --git a/arch/arm/cpu/armv8/cache_v8.c b/arch/arm/cpu/armv8/cache_v8.c
>> index c5ec529..f8c17cc 100644
>> --- a/arch/arm/cpu/armv8/cache_v8.c
>> +++ b/arch/arm/cpu/armv8/cache_v8.c
>> @@ -149,14 +149,6 @@ void flush_dcache_all(void)
>>   {
>>   }
>>   
>> -void invalidate_dcache_range(unsigned long start, unsigned long stop)
>> -{
>> -}
>> -
>> -void flush_dcache_range(unsigned long start, unsigned long stop)
>> -{
>> -}
>> -
>>   void dcache_enable(void)
>>   {
>>   }
> Are you sure about this change?

This patch deletes those above empty functions so that the driver will 
use the same weak empty functions in arch/arm/lib/cache.c, which is 
added by this patch as well.

> You are probably changing the wrong leg of the
> #if conditional code.

I don't think so. Could give me more details about this? Thanks.

Best Regards,
Josh Wu

>
> York