KARO TX25: Fix NAND Flash R/W cycle times
The NAND Flash of the KARO TX25 board is a Samsung K9F1G08U0B with 25-ns R/W
cycle times. However, the NFC clock for this board was set to 66.5 MHz, so using
the NFC driver in symmetric mode (i.e. 1 NFC clock cycle = 1 NF R/W cycle)
resulted in NF R/W cycle times of 15 ns, hence corrupted NF accesses.
This patch fixes this issue by setting the NFC clock to the highest frequency
complying to the 25-ns NF R/W cycle times specification, i.e. 33.25 MHz.
Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
Cc: John Rigby <jcrigby@gmail.com>
Cc: Scott Wood <scottwood@freescale.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Daniel Gachet <Daniel.Gachet@hefr.ch>
Acked-by: Stefano Babic <sbabic@denx.de>
diff --git a/board/karo/tx25/lowlevel_init.S b/board/karo/tx25/lowlevel_init.S
index 823df10..eb3f187 100644
--- a/board/karo/tx25/lowlevel_init.S
+++ b/board/karo/tx25/lowlevel_init.S
@@ -67,6 +67,14 @@
write32 0x53f80008, 0x20034000
/*
+ * PCDR2: NFC = 33.25 MHz
+ * This is required for the NAND Flash of this board, which is a Samsung
+ * K9F1G08U0B with 25-ns R/W cycle times, in order to make it work with
+ * the NFC driver in symmetric (i.e. one-cycle) mode.
+ */
+ write32 0x53f80020, 0x01010103
+
+ /*
* enable all implemented clocks in all three
* clock control registers
*/