[U-Boot] [PATCH 2/2] OMAP3: Add SPL support to Beagleboard

[Tom Rini <trini@ti.com>]

On 10/27/2011 04:22 PM, Scott Wood wrote:
> On 10/27/2011 06:13 PM, Tom Rini wrote:
>> On 10/27/2011 04:10 PM, Igor Grinberg wrote:
>>> On 10/27/2011 11:29 PM, Tom Rini wrote:
>>>> On 10/27/2011 02:18 PM, Igor Grinberg wrote:
>>>>> On 10/26/2011 11:13 PM, Tom Rini wrote:
>> [snip]
>>>>>> +/* nand_command: Send a flash command to the flash chip */
>>>>>> +static void nand_command(unsigned char command)
>>>>>> +{
>>>>>> + 	WRITE_NAND_COMMAND(command, NAND_ADDR);
>>>>>> +
>>>>>> +  	if (command == NAND_CMD_RESET) {
>>>>>> +		unsigned char ret_val;
>>>>>> +		nand_command(NAND_CMD_STATUS);
>>>>>> +		do {
>>>>>> +			ret_val = READ_NAND(NAND_ADDR);/* wait till ready */
>>>>>> +  		} while ((ret_val & 0x40) != 0x40);
>>>>> You should be using some kind of timeout, so you will not stuck in here
>>>>> without being noticed.
>>>> OK.  I've been wondering if we shouldn't somehow make a
>>>> not-tied-to-full-mtd nand_command more available since I suspect a few
>>>> other boards will be in a similar situation, for probing early on.
>>>
>>> That would be much better solution.
>>
>> (Background if you've otherwise ignored the thread, on some omap3 boards
>> we need to take a whack at NAND to see what DDR we have)
>>
>> OK, so, Scott, where would you suggest we put a very trivial set of nand
>> infrastructure we need outside of the scope of loading u-boot itself
>> from NAND ?
> 
> Can the SPL code be used (not an actual SPL build, just the NAND code
> associated with it)?

As-is, no, it'll fail to compile unless you fill in a number of blanks
about ECC and so forth.  If we split nand_spl_simple.c in two, we might
be able to re-use nand_command there (maybe with some re-thinking of the
#if logic for big or small pages).  Give me filenames and I'll do the
work :)

-- 
Tom