On Fri, Mar 26, 2021 at 10:38:40PM -0700, Ilya Lipnitskiy wrote: > From: Chuanhong Guo <gch981213@xxxxxxxxx> > > mt7621 has the following memory map: > 0x0-0x1c000000: lower 448m memory > 0x1c000000-0x2000000: peripheral registers > 0x20000000-0x2400000: higher 64m memory > > detect_memory_region in arch/mips/kernel/setup.c only adds the first > memory region and isn't suitable for 512m memory detection because > it may accidentally read the memory area for peripheral registers. > > This commit adds memory detection capability for mt7621: > 1. Add the highmem area when 512m is detected. > 2. Guard memcmp from accessing peripheral registers: > This only happens when a user decided to change kernel load address > to 256m or higher address. Since this is a quite unusual case, we > just skip 512m testing and return 256m as memory size. > > Signed-off-by: Chuanhong Guo <gch981213@xxxxxxxxx> > [Minor commit message reword, make mt7621_memory_detect static] > Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@xxxxxxxxx> > --- > arch/mips/include/asm/mach-ralink/mt7621.h | 7 +++--- > arch/mips/ralink/common.h | 1 + > arch/mips/ralink/mt7621.c | 29 +++++++++++++++++++--- > arch/mips/ralink/of.c | 2 ++ > 4 files changed, 32 insertions(+), 7 deletions(-) applied to mips-next. Thomas. -- Crap can work. Given enough thrust pigs will fly, but it's not necessarily a good idea. [ RFC1925, 2.3 ]
