[U-Boot] [PATCH v2 16/29] riscv: invalidate the instruction cache before jumping to Linux

[Rick Chen]

<rick at andestech.com> 於 2018年11月1日 週四 下午12:13寫道：
>
> > RISC-V does not guarantee that stores to instruction memory are visible to
> > instruction fetches (i.e. incoherent instruction caches). Invalidate the instruction
> > cache to ensure the kernel function pointer points to the correct memory
> > location.
> >
> > Signed-off-by: Lukas Auer <lukas.auer at aisec.fraunhofer.de>
> > ---
> >
> > Changes in v2:
> > - Clarify reasoning behind patch in commit message
> >
> >  arch/riscv/lib/bootm.c | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/arch/riscv/lib/bootm.c b/arch/riscv/lib/bootm.c index
> > 2b5ccce933..c1cf618806 100644
> > --- a/arch/riscv/lib/bootm.c
> > +++ b/arch/riscv/lib/bootm.c
> > @@ -40,6 +40,7 @@ int do_bootm_linux(int flag, int argc, char *argv[],
> > bootm_headers_t *images)
> >               return 1;
> >
> >       kernel = (void (*)(ulong, void *))images->ep;
> > +     invalidate_icache_all();
> >

Hi Lukas

[PATCH v2] riscv: cache: Implement i/dcache [status, enable, disable]
will implement

+void cache_flush(void)
 {
+      invalidate_icache_all();
+      flush_dcache_all();
 }

It seem redundant here.

Rick




> >       bootstage_mark(BOOTSTAGE_ID_RUN_OS);
> >
> > --
> > 2.17.2