[U-Boot] Unified u-boot feature set for simpler distro support

[Tom Rini]

On Mon, Aug 05, 2013 at 02:50:59PM -0500, Dennis Gilmore wrote:
> On Mon, 05 Aug 2013 12:39:03 -0600
> Stephen Warren <swarren at wwwdotorg.org> wrote:
> 
> > On 08/03/2013 01:11 AM, Dennis Gilmore wrote:
[snip]
> > > when it comes to memory addressing a distro and user shouldn't need
> > > to know anything. Ideally u-boot will auto allocate addresses based
> > > on the size of loaded objects. starting with a base address
> > > internal to u-boot you load a kernel, when loading an initramfs
> > > u-boot automatically calculates an address that ensures it does not
> > > overlap with the kernel. same for a fdt if loaded. I say auto
> > > calculated because what we think today will be enough room may not
> > > be tomorrow, dynamically calculating gives the flexibility for
> > > whatever may come.
> > 
> > The way I've approached this for Tegra is to have the default
> > environment define certain standard environment variables that U-Boot
> > scripts can use, without a care. For example, the kernel should be
> > loaded at ${kernel_addr_r}, initrd at ${ramdisk_addr_r}, DTB at
> > ${fdt_addr_r}, etc.
> I really don't want to need to deal with variable names either. I
> really want to just say load a kernel initramfs and here is some
> arguments and have the rest just work.

Note that the pxe menu parsing code in turn relies on ${kernel_addr_r}
and ${ramdisk_addr_r} (and ${bootargs}) to know where to place what's
requested.

-- 
Tom
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