[U-Boot] Using spi_alloc_slave() from SPL

[Stefano Babic <sbabic@denx.de>]

Hi Marek,

On 06/08/2015 16:28, Marek Vasut wrote:
> On Thursday, August 06, 2015 at 04:14:34 PM, Fabio Estevam wrote:
>> Hi Stefano and Marek,
>>
>> Thanks for the suggestions.
>>
>> On Thu, Aug 6, 2015 at 10:38 AM, Stefano Babic <sbabic@denx.de> wrote:
>>> There is the possibility to set a malloc area inside SPL:
>>>
>>> CONFIG_SYS_SPL_MALLOC_START
>>> CONFIG_SYS_SPL_MALLOC_SIZE
>>> you do not need a lot of space, and you can try to put it inside the
>>> IRAM.
>>>
>>> This should guarantee that spi_alloc_slave() works.
>>
>> So I tried moving them to the internal RAM:
>>
>> --- a/include/configs/imx6_spl.h
>> +++ b/include/configs/imx6_spl.h
>> @@ -70,8 +70,8 @@
>>  #else
>>  #define CONFIG_SPL_BSS_START_ADDR      0x18200000
>>  #define CONFIG_SPL_BSS_MAX_SIZE                0x100000        /* 1 MB */
>> -#define CONFIG_SYS_SPL_MALLOC_START    0x18300000
>> -#define CONFIG_SYS_SPL_MALLOC_SIZE     0x3200000       /* 50 MB */
>> +#define CONFIG_SYS_SPL_MALLOC_START    0x900000
>> +#define CONFIG_SYS_SPL_MALLOC_SIZE     0x8000
>>  #define CONFIG_SYS_TEXT_BASE           0x17800000
>>  #endif
>>  #endif
>>
>> but still getting spi_alloc_slave() to fail.
> 
> You want to avoid this "CONFIG_SYS_SPL_MALLOC_*" stuff, as it increases the
> SPL size by 3kiB compared to MALLOC_F . Also, MALLOC_F needs just the base
> address of the malloc area to work (see my email).

It does not matter at the moment, because Fabio's issue is not yet
solved. But is it not CONFIG_SYS_SPL_MALLOC the preferred way for SPL ?
Setting the array with MALLOC_F looks like a hack. And
CONFIG_SYS_SPL_MALLOC is *already* set for i.MX6, lool at
include/configs/imx6_spl.h:

#define CONFIG_SYS_SPL_MALLOC_START     0x18300000
#define CONFIG_SYS_SPL_MALLOC_SIZE      0x3200000       /* 50 MB */

This is in RAM, of course. Increasing the size by 3KiB is not IMHO for
i.MX6 a problem, there is enough space in IRAM. But what is surprising
is that Fabio gets a Null pointer by malloc().

Best regards,
Stefano Babic

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