[U-Boot] [PATCH] image: check "bootm_low" and "bootm_size" if "initrd_high" is missing

[Tom Rini]

On Sat, Jan 09, 2016 at 01:12:33AM +0900, Masahiro Yamada wrote:
> Hi Tom,
> 
> 
> 2016-01-05 4:59 GMT+09:00 Tom Rini <trini at konsulko.com>:
> > On Thu, Dec 17, 2015 at 05:19:35PM +0900, Masahiro Yamada wrote:
> >
> >> To boot Linux, we should prevent Initramdisk and FDT from going too
> >> high.
> >
> > OK, why?  I could be entirely wrong here but I had thought for some
> > reason that if the ramdisk was in "highmem" the kernel would relocate
> > contents (or if compressed, uncompress to a non-highmem location).  The
> > FDT must be in lowmem as that tells the kernel where memory even is.  Is
> > this not the case?  Thanks!
> 
> 
> Just in case, I asked this in the kernel ML.
> 
> 
> See this thread:
> https://lkml.org/lkml/2016/1/8/169
> 
> 
> Jon gave me the answer.
> 
> 
> 
> 5. Load initramfs.
> ------------------
> 
> Existing boot loaders:          OPTIONAL
> New boot loaders:               OPTIONAL
> 
> If an initramfs is in use then, as with the dtb, it must be placed in
> a region of memory where the kernel decompressor will not overwrite it
> while also with the region which will be covered by the kernel's
> low-memory mapping.
> 
> A safe location is just above the device tree blob which itself will
> be loaded just above the 128MiB boundary from the start of RAM as
> recommended above.

Which explains why I picked the regions I picked for ti_armv7_common.h
that I did.  So, OK, thanks!  I'll apply this patch shortly.

-- 
Tom
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