On Mon, Apr 07, 2014 at 07:05:36PM +0200, Wolfgang Denk wrote: > Dear Tom, > > In message <20140305172806.GY16805@bill-the-cat> you wrote: > > > > I'm looking over some patches for am43xx to enable the case of non-SPL > > XIP booting and this means we start getting code that's shared with > > am335x that looks like: > > What exactly do you mean by "non-SPL XIP booting"? Is this not the > standard boot mode which has actually been the first (and only one) > that U-Boot has ever been designed for, like booting from a ROM (like > parallel NOR flash)? Because the we do exactly that: we execute the > code as is from the boot device...
Exactly. But most modern platforms are not XIP booting by default, if ever. When it is, it's a special case and needs the code we usually only call in SPL (say memory controller init) linked in. Today this is done with say: #if defined(CONFIG_SPL_BUILD) || defined(CONFIG_NOR_BOOT) ... #endif on am335x. Looking at am43xx we have both traditional NOR and QSPI NOR as boot options, along with SD/NAND/various-peripheral-boots. -- Tom
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