powerpc/85xx: Add PBL boot from SPI flash support on P4080DS
PBL(pre-boot loader): SPI flash used as RCW(Reset Configuration Word) and PBI(pre-boot initialization) source, CPC(CoreNet Platform Cache) used as 1M SRAM where PBL will copy whole U-BOOT image to, U-boot can boot from CPC after PBL completes RCW and PBI phases. Signed-off-by: NChunhe Lan <b25806@freescale.com> Signed-off-by: NMingkai Hu <Mingkai.hu@freescale.com> Signed-off-by: NShaohui Xie <b21989@freescale.com> Signed-off-by: NRoy Zang <tie-fei.zang@freescale.com> Signed-off-by: NKumar Gala <galak@kernel.crashing.org>
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