[U-Boot] [v3 patch 2/4] SMDK6400: Fix some label undefined in build error

[seedshope <bocui107@gmail.com>]

On 01/15/2011 02:15 AM, Albert ARIBAUD wrote:
> Le 14/01/2011 17:56, seedshope a ?crit :
>> On 01/15/2011 12:39 AM, Albert ARIBAUD wrote:
>>> Hi seedshope,
>>>
>>> Le 14/01/2011 16:45, seedshope a ?crit :
>>>> On 01/14/2011 02:07 AM, Albert ARIBAUD wrote:
>>>>> Le 13/01/2011 14:36, seedshope a ?crit :
>>>>>> Modify Makefile for cpu_init.c and Start.s use some label,this 
>>>>>> defined
>>>>>> u-boot.lds of arch/arm/cpu/arm1176. But SMDK6400 use the link script
>>>>>> board/samsung/smdk6400/u-boot-nand.lds. So add some label form
>>>>>> u-boot.lds
>>>>>> to u-boot-nand.lds
>>>>>>
>>>>>> Signed-off-by: seedshope<bocui107@gmail.com>
>>>>>>
>>>>>> diff --git a/arch/arm/cpu/arm1176/s3c64xx/Makefile
>>>>>> b/arch/arm/cpu/arm1176/s3c64xx/Makefile
>>>>>> index 0785b19..f4b9574 100644
>>>>>> --- a/arch/arm/cpu/arm1176/s3c64xx/Makefile
>>>>>> +++ b/arch/arm/cpu/arm1176/s3c64xx/Makefile
>>>>>> @@ -30,12 +30,15 @@ LIB = $(obj)lib$(SOC).o
>>>>>>
>>>>>> SOBJS = reset.o
>>>>>>
>>>>>> -COBJS-$(CONFIG_S3C6400) += cpu_init.o speed.o
>>>>>> +COBJS-$(CONFIG_S3C6400) += speed.o
>>>>>> COBJS-y += timer.o
>>>>>>
>>>>>> +CPUINIT = cpu_init.o
>>>>>> +
>>>>>> OBJS := $(addprefix $(obj),$(SOBJS) $(COBJS-y))
>>>>>> +CPUINIT := $(addprefix $(obj),$(CPUINIT))
>>>>>>
>>>>>> -all: $(obj).depend $(START) $(LIB)
>>>>>> +all: $(obj).depend $(START) $(LIB) $(CPUINIT)
>>>>>>
>>>>>> $(LIB): $(OBJS)
>>>>>> $(call cmd_link_o_target, $(OBJS))
>>>>>
>>>>> Not sure I get what's the problem and how exactly this changes solves
>>>>> it. Can you detail this particular issue?
>>>> The issue is mem_ctrl_asm_init redefine in
>>>> arch/arm/cpu/arm1176/s3c64xx/cpu_init.s.
>>>
>>> From what follows it seems the problem is rather cpu_init.o being
>>> linked in twice. Correct?
>> maybe
>>>
>>>> At first, the link script file include cpu_init.s in
>>>> board/samsung/smd6400/u-boot-nand.s, If I separate the cpu_init.o from
>>>> COBJS-$(CONFIG_S3C6400), I guess cmd_link_o_target will deal with
>>>> cpu_init.o. So the link script will double link the cpu_init file.
>>>
>>> Then you should fix the double linking by i) determining why the
>>> double linking happens and ii) properly linking once only.
>> Hi Alvert ARIBAUD,
>>
>> I see the code for smdk6400. I found this code is very old. Before It
>> can not add cmd_link_o_target in
>> Makefile(arch/arm/cpu/arm1176/s3c64xx/Makefile), The file will only to
>> compile. So the link script is ok.
>>
>> But, Now, It is not. As far as I know, The linker script can do to link
>> the first specified file for user.
>> Since I do not full understand the cmd_link_o_target mechanism. So I
>> only guess the command do
>> some link work.
>>
>> Maybe I am correct.
>
> I don't want to accept this change on the off chance that it might be 
> correct; before your next patch submission, please try building your 
> code without this specific patch and positively find why the build fails.
Hi Amicalement

I trace the issue, I find cmd_link_o_target will link the cpu_init.o file.
If I add the file to u-boot-nand.lds file, The file will be link twice.

Now, It is good method to delete the file in u-boot-nand.s. Why? Before I
think Nand Booting for the 4kb, If you don't link the file to the first 
4kB, the system
will be generate error. Because the mem initialization function will 
can't find.

But , Now , The nand booting will be generate in nand_spl, the generate 
u-boot img is limit for 4KB,
So this is ok.

Do you think about?

Thanks,
seedshope
>
> Amicalement,