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SubjectRe: [PATCH 2/2] MIPS: ralink: mt7621: add memory detection support
On Fri, Mar 26, 2021 at 10:38:40PM -0700, Ilya Lipnitskiy wrote:
> From: Chuanhong Guo <gch981213@gmail.com>
>
> 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@gmail.com>
> [Minor commit message reword, make mt7621_memory_detect static]
> Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
> ---
> 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 ]

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