JEDEC flash confusion?

["Svend Bengt" <pastaanta@hotmail.com>]

Hi,

What chip driver should generally be used for JEDEC flash chips? When 
looking at the MTD snapshots i found both jedec.c, cfi_jedec.c and 
amd_flash.c as possible candidates. Will there be made a "unified" JEDEC 
driver which incorporates support for all JEDEC flashes?

My own story is that I have a board with Macronix MX29F800B flash chips. I 
made it work by patching the amd_flash.c to recognize Macronix manufacturer 
ID and patching physmap.c to use amd_flash instead of cfi.

Regards,
T. Vestermark


BTW.
Here is my patch to mtd-snapshot-20010609 to include support for Macronix 
flash. I hope you can use it. (Is this an OK way to supply patches?)

diff -r -C3 -P mtd_original/drivers/mtd/chips/amd_flash.c 
mtd/drivers/mtd/chips/amd_flash.c
*** mtd_original/drivers/mtd/chips/amd_flash.c Sun Jun  3 00:00:07 2001
--- mtd/drivers/mtd/chips/amd_flash.c Sun Jun 17 19:13:48 2001
***************
*** 51,56 ****
--- 51,57 ----
  #define MANUFACTURER_ST  0x0020
  #define MANUFACTURER_SST 0x00BF
  #define MANUFACTURER_TOSHIBA 0x0098
+ #define MANUFACTURER_MACRONIX   0x00C2

  /* AMD */
  #define AM29F800BB 0x2258
***************
*** 416,421 ****
--- 417,434 ----
     { offset: 0x010000, erasesize: 0x10000, numblocks: 15 }
    }
   }, {
+   mfr_id: MANUFACTURER_MACRONIX,
+   dev_id: AM29F800BB,
+   name: "Macronix MX29F800B",
+   size: 0x00100000,
+   numeraseregions: 4,
+   regions: {
+    { offset: 0x000000, erasesize: 0x04000, numblocks:  1 },
+    { offset: 0x004000, erasesize: 0x02000, numblocks:  2 },
+    { offset: 0x008000, erasesize: 0x08000, numblocks:  1 },
+    { offset: 0x010000, erasesize: 0x10000, numblocks: 15 }
+   }
+  }, {
    mfr_id: MANUFACTURER_AMD,
    dev_id: AM29LV800BT,
    name: "AMD AM29LV800BT",
***************
*** 431,436 ****
--- 444,461 ----
    mfr_id: MANUFACTURER_AMD,
    dev_id: AM29F800BT,
    name: "AMD AM29F800BT",
+   size: 0x00100000,
+   numeraseregions: 4,
+   regions: {
+    { offset: 0x000000, erasesize: 0x10000, numblocks: 15 },
+    { offset: 0x0F0000, erasesize: 0x08000, numblocks:  1 },
+    { offset: 0x0F8000, erasesize: 0x02000, numblocks:  2 },
+    { offset: 0x0FC000, erasesize: 0x04000, numblocks:  1 }
+   }
+  }, {
+   mfr_id: MANUFACTURER_MACRONIX,
+   dev_id: AM29F800BT,
+   name: "Macronix MX29F800T",
    size: 0x00100000,
    numeraseregions: 4,
    regions: {


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