Messages in this thread | | | From | Geert Uytterhoeven <> | Date | Tue, 7 Sep 2021 10:16:28 +0200 | Subject | Re: [PATCH] ARM: decompress: Use /memreserve/ DTS nodes when validating memory |
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Hoi Bert,
On Mon, Sep 6, 2021 at 12:00 PM Bert Vermeulen <bert@biot.com> wrote: > If the bootloader needs the start of memory to be preserved, for example > because it dropped the Trusted Firmware blob there, this chunk of memory > shouldn't be used by the kernel. > > To avoid adding yet another SoC-specific text offset to arch/arm/Makefile, > this patch allows for a /memreserve/ entry in the DTS to mark off the > memory chunk instead. > > Signed-off-by: Bert Vermeulen <bert@biot.com>
Thanks for your patch!
> --- a/arch/arm/boot/compressed/fdt_check_mem_start.c > +++ b/arch/arm/boot/compressed/fdt_check_mem_start.c > @@ -64,7 +64,7 @@ uint32_t fdt_check_mem_start(uint32_t mem_start, const void *fdt) > uint32_t addr_cells, size_cells, base; > uint32_t fdt_mem_start = 0xffffffff; > const fdt32_t *reg, *endp; > - uint64_t size, end; > + uint64_t rsvaddr, size, end; > const char *type; > int offset, len; > > @@ -74,6 +74,19 @@ uint32_t fdt_check_mem_start(uint32_t mem_start, const void *fdt) > if (fdt_magic(fdt) != FDT_MAGIC) > return mem_start; > > + for (offset = fdt_off_mem_rsvmap(fdt); ; offset += 16) { > + rsvaddr = get_val(fdt + offset, 8); > + size = get_val(fdt + offset + 8, 8);
The last parameter of get_val() is the number of cells, not the number of bytes. Hence it should be 2 for the 64-bit values in the memory reservation block.
The rest looks good to me.
Gr{oetje,eeting}s,
Geert
-- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds
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