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 <ma...@denx.de> >> Cc: Chin Liang See <chin.liang....@intel.com> >> Cc: Dinh Nguyen <dingu...@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_arria10_bringup/arch/arm/cpu/armv7/socfpga_arria10/lowlevel_init.S#L35 The PL310 configuration is a different register. What HW constraint ? I'd really like to understand this problem. -- Best regards, Marek Vasut _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de https://lists.denx.de/listinfo/u-boot
