[U-Boot] [U-Boot, v2, 3/3] rockchip: config: update CONFIG_SPL_MAX_SIZE for 64bit CPUs

[Soeren Moch]

> Since we move the ATF bl31 entry for 64bit CPUs to 0x40000, we need to
> limit the SPL size in 0x40000(start from 0) so that we don't need to do
> the relocate for ATF loading.
> Note that there will be separate BSS, STACK and MALLOC heap, so the size
> 0x40000(256KB) should be enough for SPL text.
> > Signed-off-by: Kever Yang <kever.yang at rock-chips.com> I tested this
series on top of v2019.10 with rockpro64-rk3399_defconfig. While it
builds fine, it does not work properly: U-Boot TPL
2019.10-00005-g7a0826a4f7-dirty (Oct 21 2019 - 10:12:53) Trying to boot
from BOOTROM Returning to boot ROM... U-Boot SPL
2019.10-00005-g7a0826a4f7-dirty (Oct 21 2019 - 10:12:53 +0200) Trying to
boot from MMC1 U-Boot TPL 2019.10-00005-g7a0826a4f7-dirty (Oct 21 2019 -
10:12:53) [boot loop] Size of u-boot-spl-nodtb.bin is 387k, so it does
not fit in 256K. (Overlap in data section?) Earlier I tried the same
u-boot version without this series but with bl31 entry point patched to
0x80000. This loads fine. One question, just for me to understand: Why
do we load u-boot SPL into limited space below bl31? Since we do not
return to SPL from bl31, we should not need to place SPL in secure DRAM.
What do I miss here? Thanks, Soeren