[U-Boot] [PATCH v1 8/9] sunxi: non-FEL SPL boot support for sun7i

Tom Rini
2014-03-14T19:03:16Z

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On 03/14/2014 02:50 PM, Hans de Goede wrote:
> Hi,
>
> On 03/14/2014 03:17 PM, Tom Rini wrote:
>> On Fri, Mar 14, 2014 at 10:33:50AM +0000, Ian Campbell wrote:
>>
>>> Based linux-sunxi#sunxi commit d854c4de2f57 "arm: Handle .gnu.hash section in
>>> ldscripts" vs v2014.01.
>> [snip]
>>> +/* Flat Device Tree (FDT/DT) support */
>>> +#define CONFIG_OF_LIBFDT
>>> +#define CONFIG_SYS_BOOTMAPSZ (16 << 20)
>>
>> This seems pretty small. This is to keep things from being relocated
>> into highmem right?
>
> Hmm, this reminds me that we currently need to do a "env set fdt_high ffffffff"
> in our boot scripts to get ftd to work at all. Would be nice to fix this for
> upstream. I'm afraid I'm clueless as to why we (sunxi) need it, but we do.

You want to be setting bootm_low (even for bootz, it's about the
underlying boot mechanics that bootz and bootelf and ... hook into) to
the amount of lowmem the kernel will have. We do this because we do
want to make sure that the device tree isn't overwritten by the kernel
BSS or similar. Everyone with more DDR than kernel lowmem needs to be
doing something along these lines.

- --
Tom
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