On 02/11/2014 11:59 AM, Wolfgang Denk wrote:
> Dear York Sun,
>
> In message <52fa7dfd.5060...@freescale.com> you wrote:
>>
>> Thanks for the insight. I am not using SPL either. I need this driver to run
>> before u-boot relocates to DDR. Everything is in flash. I need to find a
>> writable location for the variable srdata. I can put this section in linker
>> script
>>
>> .data.sram :
>> {
>> drivers/i2c/built-in.o (.data)
>> } > sram
> }
>
> Please do not invent totally new ways to have writable data before
> relocation. Use the existing machanisms. While running from flash,
> we have but what little memory we can find in on-chip memory or SRAM
> or data chace; we use this for the stack and global data (which should
> be kept as small as possible, to allow for a as much stack as possible).
>
> So ideally keep this data on the stack, and if there is no way around
> it, in the global data structure.
>
Agreed. I tried to use global data at first, which upsets Tom. Tom suggested to
use linker script. I guess he was under the impression I was using SPL. Let me
try harder to use stack.
York
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