[U-Boot] [U-Boot PATCH v2 08/12] k2hk: add support for k2hk SOC and EVM

[Tom Rini]

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On 03/07/2014 11:41 AM, Andrianov, Vitaly wrote:
> Hi Tom,
> 
> [snip]
>>>>
>>>>> +	"fdt_high=0xffffffff\0"						\
>>>>
>>>> Please don't do this, set it to the top of kernel low mem.
>>>>
>>>
>>> The EVM may have up to 8GB of DDR and u-boot can see the first 2GB
>>> with physical address range 0x80000000-0xffffffff.
>>> If we don't use the "fdt_high" environment variable, u-boot relocates
>>> the dtb to the end of that memory, which is outside of the lowmem.
>>
> [snip]
> 
>>> But K2 lowmem VA starts from 0xc0000000 and has size ~760MB. That
>>> corresponds to the physical range 0x80000000-0xaf800000.
>>> That is why we have to use the "fdt_high=0xffffffff" environment
>> variable.
>>>
>>> Have I missed something I u-boot memory configuration?
>>> Is there a way to tell u-boot to relocate fdt to the end lowmem?
>>
>> Yes, set fdt_high to 0xaf800000 instead :)
>>
> 
> I think there is a bug in the lmb_alloc_base() and this approach doesn't
> work.
> 
> else if (lmbbase < max_addr) {
> 	base = min(lmbbase + lmbsize, max_addr);
> 	base = lmb_align_down(base - size, align);
> } else
> 
> For boards that have DDR at the end of 32 bit address space the
> (lmbbase + lmbsize) = 0 which is < max_addr.
> So, base becomes 0, and moved to the "end of DDR" - size on the next line.
> 
> I tried a quick fix in the __lmb_alloc_base() and got the fdt relocated correctly.
> As I'm not sure that is only one buggy place in the lmb.c I don't want to commit
> the quick fix. Let's leave the "fdt_high=0xffffffff" in the Keystone2 for awhile      
> and change it later when we fix the bug.

If you're committing to look at this later then yes.

- -- 
Tom
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