Hi Anand,
On Thu, Sep 13, 2018 at 08:39:52PM +0530, Anand Moon wrote:
Hi Simon,
On Wed, 12 Sep 2018 at 17:25, Simon Shields simon@lineageos.org wrote:
Hi,
This patch series adds support for using U-Boot's SPL as the second stage bootloader ("BL2") on Exynos4412 SoCs.
- Patch #1 adds support for the EMMC/SD OM pin configuration, which is used by the boards I tested on.
- Patch #2 configures the magic values used to indicate system suspend state (which are identical to exynos5).
- Patch #3 renames the existing exynos4 clock/dmc initialisation code to reflect the fact that it only supports exynos4210.
- Patches #4 and #5 add/fill in structs reflecting the PMU and TZASC register layouts on exynos4412, respectively.
- Patch #6 adds the exynos4412 DMC and clock initialisation code and enables building the SPL on exynos4412 platforms.
- Patch #7 enables building the "mkexynosspl" utility for exynos4 SoCs.
The majority of the logic in patch #6 comes from a vendor u-boot dump (2010.12!), however, small portions (mostly code used for 2GB RAM initialisation) were reverse engineered from the vendor bootloader found on a GT-N7100.
This patch series has been tested on a GT-I9300 (exynos4412, 1GB RAM) and a GT-N7100 (exynos4412 prime, 2GB RAM), with a few additional patchsets applied for board/HW support (which I intend to upstream in the future).
Cheers, Simon
Could you elaborate more on how to generate stage bootloader (BL2) image, I am not aware of such process and what are next step to create SPL for Exynos platform.
I have build these patches for Odroid-U3 boards, with no SPL enable.
Of course!
You need to add "select SUPPORT_SPL" to the relevant TARGET_ kconfig entry (e.g. [0]). Then, you need to configure the SPL suitably in include/configs/<target>.h - see [1], these values should not need changing between boards. Finally, you need to enable some SPL stuff in the defconfig (see [2]). That should allow u-boot to generate a SPL binary, which should go in spl/<target>-spl.bin.
After that, you need to assemble an image suitable for flashing to an sdcard/eMMC. I use these two scripts [3], [4] combined with this BL1 [5] (originally from the ODROID-X u-boot sources, which no longer appear to be available) for eMMC and sdcard respectively.
The usage of the script is:
./create_4412_<sd|emmc>_image.sh <bl1 binary> <spl binary> <u-boot.bin> <outfile>
<outfile> can then be dd'd directly to an SD card or to the eMMC boot0 partition.
Hope that gets things working for you!
Cheers, Simon
Best Regards -Anand
[0]: https://github.com/fourkbomb/u-boot/blob/4be16a7/arch/arm/mach-exynos/Kconfi... [1]: https://github.com/fourkbomb/u-boot/blob/4be16a7/include/configs/midas.h#L31... [2]: https://github.com/fourkbomb/u-boot/blob/4be16a7/configs/midas_defconfig#L6-... [3]: https://github.com/fourkbomb/buildroot-external-midas/blob/master/board/mida... [4]: https://github.com/fourkbomb/buildroot-external-midas/blob/master/board/mida... [5]: https://github.com/fourkbomb/buildroot-external-midas/blob/master/board/mida...