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authorpekon gupta <pekon@ti.com>2013-11-18 19:03:00 +0530
committerScott Wood <scottwood@freescale.com>2013-11-21 13:33:41 -0600
commitd016dc42cedbf6102e100fa9ecb58462edfb14f8 (patch)
treea9d18ed5230c98f8f8ccd0d4b504edafdf3424b2 /doc/README.nand
parentbeba5f04f2215c81016fbfb727257ea6667aca85 (diff)
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mtd: nand: omap: enable BCH ECC scheme using ELM for generic platform
BCH8_ECC scheme implemented in omap_gpmc.c driver has following favours +-----------------------------------+-----------------+-----------------+ |ECC Scheme | ECC Calculation | Error Detection | +-----------------------------------+-----------------+-----------------+ |OMAP_ECC_BCH8_CODE_HW |GPMC |ELM H/W engine | |OMAP_ECC_BCH8_CODE_HW_DETECTION_SW |GPMC |S/W BCH library | +-----------------------------------+-----------------+-----------------+ Current implementation limits the BCH8_CODE_HW only for AM33xx device family. (using CONFIG_AM33XX). However, other SoC families (like TI81xx) also have ELM hardware module, and can support ECC error detection using ELM. This patch - removes CONFIG_AM33xx Thus this driver can be reused by all devices having ELM h/w engine. - adds omap_select_ecc_scheme() A common function to handle ecc-scheme related configurations. This can be used both during device-probe and via user-space u-boot commads to change ecc-scheme. During device probe ecc-scheme is selected based on CONFIG_NAND_OMAP_ELM or CONFIG_NAND_OMAP_BCH8 - enables CONFIG_BCH S/W library (lib/bch.c) required by OMAP_ECC_BCHx_CODE_HW_DETECTION_SW is enabled by CONFIG_BCH. - enables CONFIG_SYS_NAND_ONFI_DETECTION for auto-detection of ONFI compliant NAND devices - updates following README doc doc/README.nand board/ti/am335x/README doc/README.omap3 Signed-off-by: Pekon Gupta <pekon@ti.com> [scottwood@freescale.com: fixed unused variable warning] Signed-off-by: Scott Wood <scottwood@freescale.com>
Diffstat (limited to 'doc/README.nand')
-rw-r--r--doc/README.nand11
1 files changed, 11 insertions, 0 deletions
diff --git a/doc/README.nand b/doc/README.nand
index ce7ea5e..487548f 100644
--- a/doc/README.nand
+++ b/doc/README.nand
@@ -180,6 +180,17 @@ Configuration Options:
flexibility, so that one day we can eliminate the old mechanism.
+ CONFIG_SYS_NAND_ONFI_DETECTION
+ Enables detection of ONFI compliant devices during probe.
+ And fetching device parameters flashed on device, by parsing
+ ONFI parameter page.
+
+ CONFIG_BCH
+ Enables software based BCH ECC algorithm present in lib/bch.c
+ This is used by SoC platforms which do not have built-in ELM
+ hardware engine required for BCH ECC correction.
+
+
Platform specific options
=========================
CONFIG_NAND_OMAP_GPMC