On Thu, Jun 4, 2009 at 10:51 AM, Magnus Lilja lilja.magnus@gmail.comwrote:
2009/6/4 alfred steele alfred.jaquez@gmail.com:
The MMU is not used in ARM/U-boot, at least not on the i.MX31.
I was thinking there has to be a mechnism which defines the phystovirtual mapping table before the kernel starts running in the virtual space and the IO peripherals to access memory space/registers. Redboot does the same, hence i thought u-boot must be doing it somewhere.
That's done by the kernel in the early startup after decompressing.
/Magnus _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
u-boot needs to initialize the ram, but the MMU isn't needed by either the ram or the rest of the memory mapped I/O. For the imx27 external ram (for CSD0) is located at 0xa0000000 but like the rest of the memory map this doesn't need to be "setup".
thanks, Paul