ARM: mvebu: Netgear RN102: Use Hardware BCH ECC

The bootloader on the Netgear ReadyNAS RN102 uses Hardware BCH ECC
(strength = 4), while the pxa3xx NAND driver by default uses
Hamming ECC (strength = 1).

This patch changes the ECC mode on these machines to match that
of the bootloader and of the stock firmware. That way, it is
now possible to update the kernel from userland (e.g. using
standard tools from mtd-utils package); u-boot will happily
load and boot it.

Fixes: 92beaccd8b49 ("ARM: mvebu: Enable NAND controller in ReadyNAS 102 .dts file")
Cc: <stable@vger.kernel.org> #v3.14+
Signed-off-by: Ben Peddell <klightspeed@killerwolves.net>
Acked-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Tested-by: Arnaud Ebalard <arno@natisbad.org>
Link: https://lkml.kernel.org/r/1410339341-3372-1-git-send-email-klightspeed@killerwolves.net
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

diff --git a/arch/arm/boot/dts/armada-370-netgear-rn102.dts b/arch/arm/boot/dts/armada-370-netgear-rn102.dts
index d6d572e5af321482b20aa1fd08baed1f445a37eb..285524fb915ea4dc691aa2572228d0a52427c033 100644 (file)
--- a/arch/arm/boot/dts/armada-370-netgear-rn102.dts
+++ b/arch/arm/boot/dts/armada-370-netgear-rn102.dts
@@ -143,6 +143,10 @@
                                marvell,nand-enable-arbiter;
                                nand-on-flash-bbt;
 
+                               /* Use Hardware BCH ECC */
+                               nand-ecc-strength = <4>;
+                               nand-ecc-step-size = <512>;
+
                                partition@0 {
                                        label = "u-boot";
                                        reg = <0x0000000 0x180000>;  /* 1.5MB */