@ -98,83 +98,10 @@ Configuration Options:
CONFIG_SYS_MAX_NAND_DEVICE
The maximum number of NAND devices you want to support.
NAND Interface:
#define NAND_WAIT_READY(nand)
Wait until the NAND flash is ready. Typically this would be a
loop waiting for the READY/BUSY line from the flash to indicate it
it is ready.
#define WRITE_NAND_COMMAND(d, adr)
Write the command byte `d' to the flash at `adr' with the
CLE (command latch enable) line true. If your board uses writes to
different addresses to control CLE and ALE, you can modify `adr'
to be the appropriate address here. If your board uses I/O registers
to control them, it is probably better to let NAND_CTL_SETCLE()
and company do it.
#define WRITE_NAND_ADDRESS(d, adr)
Write the address byte `d' to the flash at `adr' with the
ALE (address latch enable) line true. If your board uses writes to
different addresses to control CLE and ALE, you can modify `adr'
to be the appropriate address here. If your board uses I/O registers
to control them, it is probably better to let NAND_CTL_SETALE()
and company do it.
#define WRITE_NAND(d, adr)
Write the data byte `d' to the flash at `adr' with the
ALE and CLE lines false. If your board uses writes to
different addresses to control CLE and ALE, you can modify `adr'
to be the appropriate address here. If your board uses I/O registers
to control them, it is probably better to let NAND_CTL_CLRALE()
and company do it.
#define READ_NAND(adr)
Read a data byte from the flash at `adr' with the
ALE and CLE lines false. If your board uses reads from
different addresses to control CLE and ALE, you can modify `adr'
to be the appropriate address here. If your board uses I/O registers
to control them, it is probably better to let NAND_CTL_CLRALE()
and company do it.
#define NAND_DISABLE_CE(nand)
Set CE (Chip Enable) low to enable the NAND flash.
#define NAND_ENABLE_CE(nand)
Set CE (Chip Enable) high to disable the NAND flash.
#define NAND_CTL_CLRALE(nandptr)
Set ALE (address latch enable) low. If ALE control is handled by
WRITE_NAND_ADDRESS() this can be empty.
#define NAND_CTL_SETALE(nandptr)
Set ALE (address latch enable) high. If ALE control is handled by
WRITE_NAND_ADDRESS() this can be empty.
#define NAND_CTL_CLRCLE(nandptr)
Set CLE (command latch enable) low. If CLE control is handled by
WRITE_NAND_ADDRESS() this can be empty.
#define NAND_CTL_SETCLE(nandptr)
Set CLE (command latch enable) high. If CLE control is handled by
WRITE_NAND_ADDRESS() this can be empty.
More Definitions:
These definitions are needed in the board configuration for now, but
may really belong in a header file.
TODO: Figure which ones are truly configuration settings and rename
them to CONFIG_SYS_NAND_... and move the rest somewhere appropriate.
#define SECTORSIZE 512
#define ADDR_COLUMN 1
#define ADDR_PAGE 2
#define ADDR_COLUMN_PAGE 3
#define NAND_ChipID_UNKNOWN 0x00
#define NAND_MAX_FLOORS 1
#define CONFIG_SYS_NAND_MAX_CHIPS 1
#define CONFIG_SYS_DAVINCI_BROKEN_ECC
CONFIG_SYS_NAND_MAX_CHIPS
The maximum number of NAND chips per device to be supported.
CONFIG_SYS_DAVINCI_BROKEN_ECC
Versions of U-Boot <= 1.3.3 and Montavista Linux kernels
generated bogus ECCs on large-page NAND. Both large and small page
NAND ECCs were incompatible with the Linux davinci git tree (since
@ -186,27 +113,17 @@ More Definitions:
NOTE:
=====
We now use a complete rewrite of the NAND code based on what is in
2.6.12 Linux kernel.
The old NAND handling code has been re-factored and is now confined
to only board-specific files and - unfortunately - to the DoC code
(see below). A new configuration variable has been introduced:
CONFIG_NAND_LEGACY, which has to be defined in the board config file if
that board uses legacy code.
The necessary changes have been made to all affected boards, and no
build breakage has been introduced, except for NETTA and NETTA_ISDN
targets from MAKEALL. This is due to the fact that these two boards
use JFFS, which has been adopted to use the new NAND, and at the same
time use NAND in legacy mode. The breakage will disappear when the
board-specific code is changed to the new NAND.
The current NAND implementation is based on what is in recent
Linux kernels. The old legacy implementation has been disabled,
and will be removed soon.
As mentioned above, the legacy code is still used by the DoC subsystem.
The consequence of this is that the legacy NAND can't be removed from
the tree until the DoC is ported to use the new NAND support (or boards
with DoC will break).
If you have board code which used CONFIG_NAND_LEGACY, you'll need
to convert to the current NAND interface for it to continue to work.
The Disk On Chip driver is currently broken and has been for some time.
There is a driver in drivers/mtd/nand, taken from Linux, that works with
the current NAND system but has not yet been adapted to the u-boot
environment.
Additional improvements to the NAND subsystem by Guido Classen, 10-10-2006
Scott Wood
16 years ago