[U-Boot] Odroid XU3 - exynos5422 - SPL - iRAM/sRAM address

[Suriyan Ramasami]

Hello Kevin,
   These are the changes that would be necessary in uboot mainline for SPL:

arch/arm/cpu/armv7/exynos/Kconfig
-       select OF_CONTROL
+       select SUPPORT_SPL
+       select OF_CONTROL if !SPL_BUILD

configs/odroid-xu3_defconfig
+CONFIG_SPL=y

include/configs/odroid_xu3.h
#undef CONFIG_SPL_TEXT_BASE
#define CONFIG_SPL_TEXT_BASE           0x02027000

#undef CONFIG_SEC_FW_SIZE
#define CONFIG_SEC_FW_SIZE (15 << 10) /* 15 KB */

 FWICT, mainline uboot does not have code to handle secure firmware.
For instance when secure firmware is present the address to poke a
jump address for the CPU is different (nsram +1c etc). This stems from
lowlevel_init.S being moved over to the NS area. This is also missing
in uboot mainline or so I think.

I hope this helps you out.

The ddr init functions seem to be not correct for the 5422 (or so I
think). I do not have access to any of the Samsung docs, hence, one
solution was to copy over HKs ddr init function, and then the mainline
SPL runs.

Regards
- Suriyan


On Tue, Jan 20, 2015 at 1:30 PM, Kevin Hilman <khilman at kernel.org> wrote:
> Hello Suriyan,
>
> Suriyan Ramasami <suriyan.r at gmail.com> writes:
>
>> Hello Sjoerd Simons,
>>    A signed BL2 which allows unsigned BL2 chain load is already
>> available for experimentation. Refer this link:
>> http://forum.odroid.com/viewtopic.php?f=98&t=6147#p58984
>> The suriyan.bl2-hkxu3.1212.5422.zip blob contains a signed BL2 which
>> allows the same.
>> The layout of SD card is as follows:
>>
>> BL1 (1 to 30) 15K
>> BL2 (31 to 62) 16K
>> indicator block (63 to 64) 1K
>> uboot (65 to 2112) 1M
>> tzsw (2113 to 2624) 256K
>> unsigned BL2 (2625 to 2656) 16K
>>
>> A non zero in the first byte of the indicator block instructs the
>> signed BL2 to load the unsigned BL2 @ offset 2625.
>
> I'm currently running mainline u-boot, and hoping to test the series
> that powers down secondary cores on the odroid-xu3.  That series applies
> and builds with mainline u-boot (v2015.01-rc3), but for it to work
> correctly, IIUC, I'll also need to build an SPL from mainline.
>
> Can you share your changes to mainline u-boot that enable the building
> of SPL?
>
> I'd like to try that using your BL2 that will load an unsigned BL2.
>
> Thanks,
>
> Kevin