On 05/31/2018 11:52 AM, See, Chin Liang wrote:
On Tue, 2018-05-29 at 18:39 +0200, Marek Vasut wrote:
Make sure the ARM ACTLR register has correct configuration, otherwise the Linux kernel refuses to boot. In particular, the "Write Full Line of Zeroes" bit must be cleared.
Signed-off-by: Marek Vasut marex@denx.de Cc: Chin Liang See chin.liang.see@intel.com Cc: Dinh Nguyen dinguyen@kernel.org
NOTE: This gem was well hidden in the Altera U-Boot fork and is really needed. What is not entirely clear to me is WHY ? So why is this needed ?
I vaguely recall it's related to HW constrain. And check back the downstream U-Boot, actually we need to set the bit instead clearing it. https://github.com/altera-opensource/u-boot-socfpga/blob/socfpga_v2 014.10_arria10_bringup/arch/arm/cpu/armv7/socfpga_arria10/pl310.c
You are clearing it here: https://github.com/altera-opensource/u-boot-socfpga/blob/socfpga_v2014.10_ar...
The PL310 configuration is a different register. What HW constraint ? I'd really like to understand this problem.