[U-Boot] [PATCH v1 8/8] mpc85xx: introduce the kmp204x reference design support

[York Sun]

On 08/19/2013 05:48 PM, Scott Wood wrote:
> On Mon, 2013-08-19 at 17:50 +0200, Valentin Longchamp wrote:
>> On 08/13/2013 11:38 PM, Scott Wood wrote:
>>> On Fri, 2013-07-26 at 12:02 +0200, Valentin Longchamp wrote:

<snip>

>>>> +	/* TLB 1 */
>>>> +	/* *I*** - Covers boot page */
>>>> +	/* *I*G - L3SRAM. When L3 is used as 1M SRAM, the address of the
>>>> +	 * SRAM is at 0xfff00000, it covered the 0xfffff000.
>>>> +	 */
>>>> +	SET_TLB_ENTRY(1, CONFIG_SYS_INIT_L3_ADDR, CONFIG_SYS_INIT_L3_ADDR,
>>>> +		      MAS3_SX|MAS3_SW|MAS3_SR, MAS2_I|MAS2_G,
>>>> +		      0, 0, BOOKE_PAGESZ_1M, 1),
>>>
>>> What does that "covers boot page" comment refer to?
>>>
>>> Why is L3SRAM I+G?
>>>
>>
>> I have taken this from the corenet SYS_RAMBOOT boot scenario since it's also the
>> way our board boots.
> 
> York, can you answer this?
> 
> I suspect the "covers boot page" comment is left over from before the
> recent spin table changes.

Look at the context, this is used as SRAM with PBL boot method. Notice
these macros in header file

+#define CONFIG_SYS_RAMBOOT
+#define CONFIG_RAMBOOT_PBL
+#define CONFIG_RAMBOOT_TEXT_BASE	CONFIG_SYS_TEXT_BASE

and

+/*
+ *  Config the L3 Cache as L3 SRAM
+ */
+#define CONFIG_SYS_INIT_L3_ADDR		CONFIG_RAMBOOT_TEXT_BASE
+#define CONFIG_SYS_INIT_L3_ADDR_PHYS	(0xf00000000ull | \
+		CONFIG_RAMBOOT_TEXT_BASE)
+#define CONFIG_SYS_L3_SIZE		(1024 << 10)
+#define CONFIG_SYS_INIT_L3_END (CONFIG_SYS_INIT_L3_ADDR +
CONFIG_SYS_L3_SIZE)

York