On 06/05/2017 12:50 PM, Alexey Brodkin wrote: > This initial port adds support of ARC HS Development Kit board with some > basic features such serial port, USB, SD/MMC and Ethernet. > > Essentially we run Linux kernel on all 4 cores (i.e. utilize SMP) and > heavily use IO Coherency for speeding-up DMA-aware peripherals. > > Note as opposed to other ARC boards we link Linux kernel to > 0x9000_0000 intentionally because cores 1 and 3 configured with DCCM > situated at our more usual link base 0x8000_0000. > > Signed-off-by: Eugeniy Paltsev <paltsev at synopsys.com> > Signed-off-by: Alexey Brodkin <abrodkin at synopsys.com> > Cc: Vineet Gupta <vgupta at synopsys.com> > Cc: Rob Herring <robh+dt at kernel.org> > --- > > Changes v3 -> v4: > * Removed senseless "ranges" property from "memory" node in .dts > * Refined early-boot code: > - CREG_PAE should be set only once thus master does that in init_early() > - ICCM relocation should be done on each and every core that sports ICCM > so we leave it in init_per_cpu(). Even though init_per_cpu() gets called > on the master core pretty late still it is way much earlier than that > moment when it might affect us - as it only huts us when addresses in > 0x7z-0x7fff_ffff range are used, i.e. virtual addresses that we don't > use during init. This also makes code much cleaner compared to > additional check in case of master etc. So you are assuming that vmalloc machinery would not have kicked in by then i.e. by the time of irq_init() i.e. - perhaps that is true. Lets go with what you have now.... -Vineet
