On Tue, Nov 16, 2010 at 3:41 PM, <dirk.brandewie@xxxxxxxxx> wrote:
> From: Dirk Brandewie <dirk.brandewie@xxxxxxxxx>
>
> Adds a kernel command line option "dtb_compat=<string>" and functions
> for architecture/platform specific code to retrieve the command line
> string and locate the compatible DTB linked into the kernel
>
> of_flat_dt_get_dtb_compatible_string() returns a pointer string passed
> from the command line or a pointer to an empty string.
>
> of_flat_dt_find_compatible_dtb() returns a pointer to a DTB that is
> compatible with the "compatible" string or a NULL pointer if no
> matching DTB is present.
>
> Signed-off-by: Dirk Brandewie <dirk.brandewie@xxxxxxxxx>
> ---
[...]
> +void __init *of_flat_dt_find_compatible_dtb(char *name)
> +{
> + void *rc = NULL;
> + unsigned long root, size;
> + struct boot_param_header *orig_initial_boot_params;
> + uint8_t *blob;
> +
> + orig_initial_boot_params = initial_boot_params;
> + blob = __dtb_start;
> + initial_boot_params = (struct boot_param_header *)blob;
> +
> + while (blob < __dtb_end &&
> + (be32_to_cpu(initial_boot_params->magic) == OF_DT_HEADER)) {
The kernel needs to complain *loudly* if this occurs because it
represents a bug. I'm tempted to say use BUG, but that would halt the
kernel and prevent any possibility of kernel log output. WARN_ON() is
probably best.
g.
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