Re: [RFC] ARM: exynos: MCPM: [is this a] fix for secondary boot on 5422?

[Przemyslaw Marczak <p.marczak@samsung.com>]

On 06/15/2015 01:19 PM, Amit Kucheria wrote:
> On Mon, Jun 15, 2015 at 3:49 PM, Przemyslaw Marczak
> <p.marczak@samsung.com> wrote:
>> Hello Krzysztof,
>>
>>
>> On 06/14/2015 10:56 AM, Krzysztof Kozłowski wrote:
>
> <snip>
>
>> I'm trying port the hardkernel's SPL to the mainline U-Boot at present. The
>> mainline SPL is implemented for E5420 and E5800. But there are few
>> differences:
>> - different DRAM
>> - different clocks
>> - different boot core (peach-pi boots from A15)
>> - bl2 signature
>> - hdk's SPL uses smc calls
>> ... and some more.
>
> This is really good news! Would this work leave CCI control to Linux
> so that we may use MCPM to manage cpu and cluster OFF?
>

Yes, I would like to get this stuff working.

>> The BL1 keeps signature key and some part of code, but it's code is
>> proprietary - but we should be able to setup the secondary cores in BL2.
>>
>> When, I get the basic setup working, then I'm going to focus on the
>> secondary CPU's init. I don't have the documentation for iROM code, so
>> everything takes a while.
>>
>>   If you looking for the lowlevel code, which is executed after wakeup,
>> please check this :
>> https://github.com/hardkernel/u-boot/blob/odroidxu3-v2012.07/board/samsung/smdk5422/lowlevel_init.S
>>
>> The 'lowlevel_init' label is always executed on boot.
>

Best regards,
-- 
Przemyslaw Marczak
Samsung R&D Institute Poland
Samsung Electronics
p.marczak@samsung.com