[U-Boot] [u-boot PATCH] arm, lib/bootm.c: Exclude HIGHMEM from being used by u-boot
Albert ARIBAUD
albert.u.boot at aribaud.net
Sat Aug 20 08:01:21 CEST 2011
Hi David,
Le 19/08/2011 19:57, David Long a écrit :
>
> Reserve any memory above 768MB to prevent u-boot from relocating fdt or initrd
> data into memory that Linux cannot reference during early boot. Code taken (with
> modifications) from the powerpc bootm.c.
What exactly prevents ARM Linux from booting when FDT or initrd are
above 768MB? Can this limitation not be lifter on the Linux side?
Also:
> Signed-off-by: David A. Long<dave.long at linaro.org>
> ---
> arch/arm/lib/bootm.c | 24 +++++++++++++++++++++++-
> 1 files changed, 23 insertions(+), 1 deletions(-)
>
> diff --git a/arch/arm/lib/bootm.c b/arch/arm/lib/bootm.c
> index 802e833..437ef35 100644
> --- a/arch/arm/lib/bootm.c
> +++ b/arch/arm/lib/bootm.c
> @@ -32,6 +32,10 @@
>
> DECLARE_GLOBAL_DATA_PTR;
>
> +#ifndef CONFIG_SYS_LINUX_LOWMEM_MAX_SIZE
> +#define CONFIG_SYS_LINUX_LOWMEM_MAX_SIZE (768*1024*1024)
> +#endif
I'd tend to think that if no max size was defined, then we should not limit.
> +
> #if defined (CONFIG_SETUP_MEMORY_TAGS) || \
> defined (CONFIG_CMDLINE_TAG) || \
> defined (CONFIG_INITRD_TAG) || \
> @@ -60,7 +64,25 @@ static int bootm_linux_fdt(int machid, bootm_headers_t *images);
>
> void arch_lmb_reserve(struct lmb *lmb)
> {
> - ulong sp;
> + phys_size_t bootm_size;
> + ulong size, sp, bootmap_base;
> +
> + bootmap_base = getenv_bootm_low();
> + bootm_size = getenv_bootm_size();
> +
> +#ifdef DEBUG
> + if (((u64)bootmap_base + bootm_size)>
> + (CONFIG_SYS_SDRAM_BASE + (u64) gd->ram_size))
> + puts("WARNING: bootm_low + bootm_size exceed total memory\n");
> +#endif
> +
> + size = min(bootm_size, CONFIG_SYS_LINUX_LOWMEM_MAX_SIZE);
> +
> + if (size< bootm_size) {
> + ulong base = bootmap_base + size;
> + printf("WARNING: adjusting available memory to %lx\n", size);
> + lmb_reserve(lmb, base, bootm_size - size);
> + }
>
> /*
> * Booting a (Linux) kernel image
Amicalement,
--
Albert.
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