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KARO TX25: Fix NAND Flash R/W cycle times

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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>
This commit is contained in:
Benoît Thébaudeau 2012-08-08 03:55:32 +00:00 committed by Stefano Babic
parent 362635bd50
commit 5527024fdb
1 changed files with 8 additions and 0 deletions
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8
board/karo/tx25/lowlevel_init.S
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@ -66,6 +66,14 @@
write32 0x53f80064, 0x45600000
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