sh: Add a flag which controls the DDR ECC mode of sh7757lcr
When DDR-ECC is effective, the physical memory which can be used reduces this boardby half. However, this mode can chenge to disable. When it was disabled, user can use 512 MB of physical memory. Signed-off-by: NNobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com> CC: "Yoshihiro Shimoda" <yoshihiro.shimoda.uh@renesas.com> Acked-by: N"Yoshihiro Shimoda" <yoshihiro.shimoda.uh@renesas.com> Signed-off-by: NNobuhiro Iwamatsu <iwamatsu@nigauri.org>
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