[U-Boot] [RFC 1/1] configs: rk3288: SPL file must fit into 32 KiB

[Simon Goldschmidt]

Am 13.02.2019 um 21:26 schrieb Philipp Tomsich:
> 
> 
>> On 13.02.2019, at 21:19, Simon Goldschmidt 
>> <simon.k.r.goldschmidt at gmail.com 
>> <mailto:simon.k.r.goldschmidt at gmail.com>> wrote:
>>
>> Am 13.02.2019 um 21:13 schrieb Heinrich Schuchardt:
>>> The SPL image for the rk3288 boards has to fit into 32 KiB. This includes
>>> 4 KiB for the device tree and up to 2 KiB for the file header.
>>
>> I'm not related to this board (and don't mean to step against this 
>> patch), but I have similar problems on socfpga (though with 64 KiB, 
>> not 32 KiB) and trying to solve them, so:
>>
>> How do you know the DTB is 4 KiB maximum? Is there a check for this?
>>
>> Aside from that, I don't know how it is for rk3288, but socfpga 
>> allocates initial stack, heap and 'gd' into the same RAM, so available 
>> size check should also substract that from my 64 KiB. How is this 
>> handled here?
> 
> The RK3288 has ~ 100kB of SRAM, but the BootROM has a size limitation on 
> loading the SPL stage.
> So stack will always be located beyond the end of the SPL.

Aha, so it's not comparable to socfgpa in that respect. Thanks for the info!

Regards,
Simon