cfi_flash: reverse geometry for newer STM parts

For newer STM parts where CFI >= 1.1, there is a byte in the extended structure that declares the flash layout type (just like the AMD parts), so key off of that to find out when we need to reverse the geometry.

This can be seen with M29W640 parts where U-Boot does:
Bank # 1: CFI conformant FLASH (16 x 16) Size: 8 MB in 135 Sectors
AMD Standard command set, Manufacturer ID: 0x20, Device ID: 0x22ED Erase timeout: 8192 ms, write timeout: 1 ms
Buffer write timeout: 1 ms, buffer size: 16 bytes

Sector Start Addresses:

  20000000   RO   20002000   RO   20004000   RO   20006000   RO   20008000   RO
  2000A000   RO   2000C000   RO   2000E000   RO   20010000   RO   20020000   RO

...

But Linux does:
physmap platform flash device: 00800000 at 20000000 physmap-flash.0: Found 1 x16 devices at 0x0 in 16-bit bank.

                 Manufacturer ID 0x000020 Chip ID 0x0022ed

physmap-flash.0: Swapping erase regions for top-boot CFI table.

---
 drivers/mtd/cfi_flash.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

index 69f12d3..13774c4 100644
@@ -1858,6 +1858,10 @@ static void flash_fixup_stm(flash_info_t *info, struct cfi_qry *qry)
 			    info->device_id == 0x22D7) { /* M29W800DT */
 				cfi_reverse_geometry(qry);
 			}
+		} else if (flash_read_uchar(info, info->ext_addr + 0xf) == 3) {
+			/* CFI >= 1.1, deduct from top/bottom flag */
+			/* note: ext_addr is valid since cfi_version > 0 */
+			cfi_reverse_geometry(qry);
 		}
 	}
 }

1.7.5.rc3

ping ...
-mike
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Hi Mike,

I'll take care of it later today.

Cheers,
Stefan

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DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-0 Fax: (+49)-8142-66989-80 Email: office at denx.de

Applied to u-boot-cfi-flash/master. Thanks.

Cheers,
Stefan

--
DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-0 Fax: (+49)-8142-66989-80 Email: office at denx.de