Please hold on this patch. I found some problem with it.
Regards,
Shawn
On Sat, Jan 07, 2012 at 10:39:53PM +0800, Shawn Guo wrote:
> The commit message of a28afca (Add uboot "fdt_high" enviroment variable)
> states that fdt_high behaves similarly to the existing initrd_high.
> But fdt_high actually has an outstanding difference from initrd_high.
> The former specifies the start address, while the later specifies the
> end address.
>
> As fdt_high and initrd_high will likely be used together, it'd be nice
> to have them behave same. The patch changes the behavior of fdt_high
> to have it aligned with initrd_high.
>
> The document of fdt_high in README is updated with an example to
> demonstrate the usage of this environment variable.
>
> Signed-off-by: Shawn Guo <shawn....@linaro.org>
> ---
> Changes since v1:
> * Update document of fdt_high with an example to demonstrate the usage
>
> README | 8 ++++++++
> common/image.c | 6 ++----
> 2 files changed, 10 insertions(+), 4 deletions(-)
>
> diff --git a/README b/README
> index ff72e47..1c3713c 100644
> --- a/README
> +++ b/README
> @@ -3619,6 +3619,14 @@ List of environment variables (most likely not
> complete):
>
> fdt_high - if set this restricts the maximum address that the
> flattened device tree will be copied into upon boot.
> + For example, if you have a system with 1 GB memory
> + at physical address 0x10000000, while Linux kernel
> + only recognizes the first 704 MB as low memory, you
> + may need to set fdt_high as 0x3C000000 to have the
> + device tree blob be copied to the maximum address
> + of the 704 MB low memory, so that Linux kernel can
> + access it during the boot procedure.
> +
> If this is set to the special value 0xFFFFFFFF then
> the fdt will not be copied at all on boot. For this
> to work it must reside in writable memory, have
> diff --git a/common/image.c b/common/image.c
> index 77ca6e4..12ceacf 100644
> --- a/common/image.c
> +++ b/common/image.c
> @@ -1294,10 +1294,8 @@ int boot_relocate_fdt(struct lmb *lmb, char
> **of_flat_tree, ulong *of_size)
> if (desired_addr) {
> of_start =
> (void *)(ulong) lmb_alloc_base(lmb, of_len, 0x1000,
> - ((ulong)
> - desired_addr)
> - + of_len);
> - if (desired_addr && of_start != desired_addr) {
> + (ulong)desired_addr);
> + if (of_start == 0) {
> puts("Failed using fdt_high value for Device
> Tree");
> goto error;
> }
> --
> 1.7.4.1
>
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