[U-Boot] [PATCH] fdt: Fix bug in size calculation in fdt_resize() with initrd use

[Wolfgang Denk <wd@denx.de>]

Dear Stefan Roese,

In message <1280845363-23197-1-git-send-email-sr@denx.de> you wrote:
> From: Feng Wang <fwang02@harris.com>
> 
> Original bug description from Feng (fdt_resize() bug caused "WARNING:
> could not set linux, initrd-start FDT_ERR_NOSPACE."):
> 
> What I got is an error: "WARNING: could not set linux,initrd-start
> FDT_ERR_NOSPACE." after loading Device Tree blob. This in turn caused
> linux to miss init part.
> 
> After some digging, I found out the reason for this error, it is caused
> by fdt_resize().
> 
> FDT blob got resized after filling in all board specific information of
> PowerPC. (in boot_body_linux()). It reduced blob size with only extra
> space for two fdt_reserve_entry, one for fdt itself, and one for initrd.
> Then it's aligned to a 0x1000 page boundary. However, later in
> fdt_initrd(), it could add two more properties, initrd-start AND
> initrd-end, each one needs at least two fdt_reserve_entry sizes done by
> _fdt_add_property() (name and value). Thus, the two fdt_reserve_entry
> extra space is not sufficient.
> 
> So for some specific fdt size which is just under the page boundary
> after resizing, this will cause an error of FDT_ERR_NOSPACE in
> fdt_initrd() when setting those two properties, and failed to pass
> initrd information to linux.
> 
> My fix is in fdt_resize(), leave at least 4 fdt_reserve_entry for
> initrd. So instead of 2*sizeof(struct fdt_reserve_entry) for
> actual_totalsize, use 5*sizeof(struc fdt_reserve_entry).
> 
> Stefan: I got this same error on katmai, when trying to boot with
> initrd (run flash_self). This patch fixes this issue.
> 
> Signed-off-by: Feng Wang <fwang02@harris.com>
> Tested-by: Stefan Roese <sr@denx.de>
> Cc: Jerry Van Baren <gvb.uboot@gmail.com>
> ---
>  common/fdt_support.c |    7 ++++---
>  1 files changed, 4 insertions(+), 3 deletions(-)

Applied, thanks.

Best regards,

Wolfgang Denk

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