[U-Boot] [PATCH 0/4] sf: Accessing > 16MBytes flashes in existing 3-byte addr mode.

[Jagannadha Sutradharudu Teki]

The current implementation in spi_flash supports 3-byte address mode
due to this up to 16MB amount of flash is able to access for those
flashes which has an actual size of > 16MB.

List of flashes:
S25FL256S
N25Q256
N25Q256A
W25Q256(not yet mainlined)

extended/bank address register contains an information to access the
4th byte addressing hence the flashes which has > 16MB can be accessible.

extended/bank address read/write commands in spansion & winbond/stmicro
are different, currently I have added support for spansion.

if the user is giving an offset > 0x1000000 for read/write/erase commands
the implementation will subtract the offset from 0x1000000 and then enable the
extended/bank address register.

[pseudo]
if (offset > 0x1000000) {
        offset -= 0x1000000;
        enable the ext/bank addr register
} else
        disable the ext/bank addr register


Thanks,
Jagan.

Jagannadha Sutradharudu Teki (4):
  sf: Add extended address register writing support
  sf: Add extended address register reading support
  sf: Add extended address access support
  sf: winbond: Add support for W25Q256

 drivers/mtd/spi/spi_flash.c          |  145 ++++++++++++++++++++++++++++++++++
 drivers/mtd/spi/spi_flash_internal.h |   18 ++++
 drivers/mtd/spi/winbond.c            |    5 +
 3 files changed, 168 insertions(+), 0 deletions(-)

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1.7.4