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As per following Sections in ONFI Spec, NAND_CMD_READID should use only
lower 8-bit for transfering command, address and data even on x16 NAND device.
*Section: Target Initialization"
"The Read ID and Read Parameter Page commands only use the lower 8-bits of the
data bus. The host shall not issue commands that use a word data width on x16
devices until the host determines the device supports a 16-bit data bus width
in the parameter page."
*Section: Bus Width Requirements*
"When the host supports a 16-bit bus width, only data is transferred at the
16-bit width. All address and command line transfers shall use only the lower
8-bits of the data bus. During command transfers, the host may place any value
on the upper 8-bits of the data bus. During address transfers, the host shall
set the upper 8-bits of the data bus to 00h."
Thus porting following commit from linux-kernel to ensure that column address
is not altered to align to x16 bus when issuing NAND_CMD_READID command.
commit 3dad2344e92c6e1aeae42df1c4824f307c51bcc7
mtd: nand: force NAND_CMD_READID onto 8-bit bus
Author: Brian Norris <computersforpeace@gmail.com> (preserving authorship)
The NAND command helpers tend to automatically shift the column address
for x16 bus devices, since most commands expect a word address, not a
byte address. The Read ID command, however, expects an 8-bit address
(i.e., 0x00, 0x20, or 0x40 should not be translated to 0x00, 0x10, or
0x20).
This fixes the column address for a few drivers which imitate the
nand_base defaults.
Signed-off-by: Pekon Gupta <pekon@ti.com>
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|---|---|---|
| .. | ||
| am335x_spl_bch.c | ||
| atmel_nand_ecc.h | ||
| atmel_nand.c | ||
| bfin_nand.c | ||
| davinci_nand.c | ||
| docg4_spl.c | ||
| docg4.c | ||
| fsl_elbc_nand.c | ||
| fsl_elbc_spl.c | ||
| fsl_ifc_nand.c | ||
| fsl_ifc_spl.c | ||
| fsl_upm.c | ||
| fsmc_nand.c | ||
| jz4740_nand.c | ||
| kb9202_nand.c | ||
| kirkwood_nand.c | ||
| kmeter1_nand.c | ||
| Makefile | ||
| mpc5121_nfc.c | ||
| mxc_nand_spl.c | ||
| mxc_nand.c | ||
| mxc_nand.h | ||
| mxs_nand.c | ||
| nand_base.c | ||
| nand_bbt.c | ||
| nand_bch.c | ||
| nand_ecc.c | ||
| nand_ids.c | ||
| nand_plat.c | ||
| nand_spl_load.c | ||
| nand_spl_simple.c | ||
| nand_util.c | ||
| nand.c | ||
| ndfc.c | ||
| nomadik.c | ||
| omap_elm.c | ||
| omap_gpmc.c | ||
| s3c2410_nand.c | ||
| tegra_nand.c | ||
| tegra_nand.h | ||