Hi Guo,
On Fri, Feb 11, 2022 at 4:56 AM Chuanhong Guo <gch981213@xxxxxxxxx> wrote:
>
> It's reported that current memory detection code occasionally detects
> larger memory under some bootloaders.
> Current memory detection code tests whether address space wraps around
> on KSEG0, which is unreliable because it's cached.
>
> Rewrite memory size detection to perform the same test on KSEG1 instead.
> While at it, this patch also does the following two things:
> 1. use a fixed pattern instead of a random function pointer as the magic
> value.
> 2. add an additional memory write and a second comparison as part of the
> test to prevent possible smaller memory detection result due to
> leftover values in memory.
>
> Fixes: 139c949f7f0a MIPS: ("ralink: mt7621: add memory detection support")
> Reported-by: Rui Salvaterra <rsalvaterra@xxxxxxxxx>
> Signed-off-by: Chuanhong Guo <gch981213@xxxxxxxxx>
> ---
> arch/mips/ralink/mt7621.c | 36 +++++++++++++++++++++++-------------
> 1 file changed, 23 insertions(+), 13 deletions(-)
Thanks! Nothing seems to be broken after these changes, at least for
my boards :)
Tested-by: Sergio Paracuellos <sergio.paracuellos@xxxxxxxxx>
Best regards,
Sergio Paracuellos
