damaged DoC MD2808-D08?

Niki Waibel niki.waibel at newlogic.com
Wed Sep 17 06:13:09 EDT 2003 

my DoC MD2808-D08 responds fine to the control registers
(chipid and ecc toggle bit are ok i.e.).

but if it comes to the stage of sending nand commands and
reading memory it seems to do nothing.

if mem is read from the same IO reg (0x800) then
i always get the same value (0x55). also if the
nand ID command is sent, 0x800 responses with 0x55.
0x55 is the beginning of 0x55 0xaa 0x10 0xeb which
is the beginning of the IPL code (rom extension)...

in addition if i read a page. and then read it again.
i get some different bytes:
===
--- xxx.xxd     2003-09-17 12:01:44.615883064 +0200
+++ xxx2.xxd    2003-09-17 12:01:44.629880936 +0200
@@ -1,67 +1,67 @@
 0000000: 55aa 10eb 3c00 0028 4329 4d2d 5379 7374  U...<..(C)M-Syst
 0000010: 656d 7331 3939 3800 0000 2100 0004 001c  ems1998...!.....
 0000020: 5524 506e 5001 0200 0000 1e6d 1a01 1000  U$PnP......m....
-0000030: 0000 0000 8001 9400 0000 0000 8181 8181  ................
+0000030: 0000 0000 8001 9400 0000 0000 8181 98e6  ................
 0000040: 009c 5053 5152 5657 551e 06ba c01f 33c0  ..PSQRVWU.....3.
-0000050: 8ec0 33ff 83c2 408e da81 fa00 8181 8181  ..3... at .........
+0000050: 8ec0 33ff 83c2 408e da81 fa00 439a 8181  ..3... at .....C...
 0000060: f6b9 0002 fcad 0bc0 75e8 e2f9 83ff 0075  ........u......u
-0000070: 021e 0747 83ff 3072 8181 8181 8181 98e6  ...G..0r........
+0000070: 021e 0747 83ff 3072 8181 98e6 439a 8181  ...G..0r....C...
 0000080: 588e c20e 1f8b ec83 ec04 8cc0 8c46 fec7  X............F..
 0000090: 46fc ab00 0ee8 1300 8b46 fe8e c033 ffb9  F........F...3..
 00000a0: 0060 33c0 fcf3 ab8b e5eb 7455 8bec 8b46  .`3.......tU...F
-00000b0: 048e d8bb 0000 c687 439a 0081 8181 8198  ........C.......
+00000b0: 048e d8bb 0000 c687 0381 0081 8181 8181  ................
 00000c0: c687 0210 85be 0008 b1ff e85d 00fc 32e4  ...........]..2.
-00000d0: b100 e855 002e 8b0e e643 9a81 8181 8181  ...U.....C......
+00000d0: b100 e855 002e 8b0e 8181 8181 8181 8181  ...U............
 00000e0: 7523 c687 0410 0d2e 8b16 1c00 8181 8181  u#..............
-00000f0: 8814 8834 8181 8181 8181 8181 8181 8198  ...4............
+00000f0: 8898 8834 e643 9a81 8181 8198 e643 9a81  ...4.C.......C..
 0000100: 1009 e836 0084 870d 10ac 02e0 aa4e e2cc  ...6.........N..
 0000110: 2e3a 2620 0075 065d 0633 c050 cb5d cb07  .:& .u.].3.P.]..
 0000120: 1f5d 5f5e 5a59 5b58 9dcb c687 0410 0b88  .]_^ZY[X........
-0000130: 0cc6 871e 1000 c687 0410 09f6 e643 9a81  .............C..
+0000130: 0cc6 871e 1000 c687 0410 09f6 8181 8181  ................
 0000140: f687 2010 80f6 8720 1080 f687 2010 80f6  .. .... .... ...
-0000150: 8704 1080 74f9 f687 2010 80f6 8181 8198  ....t... .......
-0000160: c31c 0000 0000 0000 0000 0000 e600 439a  ..............C.
-0000170: 0000 0000 0000 8181 8181 8181 8181 8181  ................
+0000150: 8704 1080 74f9 f687 2010 80f6 8181 8181  ....t... .......
+0000160: c31c 0000 0000 0000 0000 0000 0000 8181  ................
+0000170: 0000 0000 8181 0000 8181 8181 8181 8198  ................
 0000180: 0000 0000 0000 0000 0000 0000 0000 0000  ................
 0000190: 0000 0000 0000 0000 0000 0000 0000 0000  ................
 00001a0: 0000 0000 0000 0000 0000 0000 0000 0000  ................
-00001b0: 0000 0000 0000 0000 8181 8181 8181 8181  ................
+00001b0: 0000 0000 0000 0000 e643 9a81 8181 8198  .........C......
 00001c0: 0000 0000 0000 0000 0000 0000 0000 0000  ................
-00001d0: 0000 0000 0000 0000 8181 98e6 439a 8181  ............C...
-00001e0: 0000 0000 0000 0000 0000 0000 8181 98e6  ................
-00001f0: 0000 0000 439a 8181 8181 8181 8181 8181  ....C...........
+00001d0: 0000 0000 0000 0000 e643 9a81 8181 8181  .........C......
+00001e0: 0000 0000 0000 0000 0000 0000 8181 8181  ................
+00001f0: 8100 0000 8181 8181 8181 8181 8181 9898  ................
 0000200: 55aa 10eb 3c00 0028 4329 4d2d 5379 7374  U...<..(C)M-Syst
 0000210: 656d 7331 3939 3800 0000 2100 0004 001c  ems1998...!.....
 0000220: 5524 506e 5001 0200 0000 1e6d 1a01 1000  U$PnP......m....
-0000230: 0000 0000 8001 9400 0000 0000 8181 8181  ................
+0000230: 0000 0000 8001 9400 0000 0000 439a 8181  ............C...
 0000240: 009c 5053 5152 5657 551e 06ba c01f 33c0  ..PSQRVWU.....3.
-0000250: 8ec0 33ff 83c2 408e da81 fa00 8181 8181  ..3... at .........
-0000260: f6b9 0002 fcad 0bc0 75e8 e2f9 83ff 8175  ........u......u
-0000270: 021e 0747 83ff 3072 8198 e643 9a81 8181  ...G..0r...C....
+0000250: 8ec0 33ff 83c2 408e da81 fa00 8181 98e6  ..3... at .........
+0000260: f6b9 0002 fcad 0bc0 75e8 e2f9 83ff 0043  ........u......C
+0000270: 021e 0747 83ff 3072 9a81 8181 8181 8181  ...G..0r........
 0000280: 588e c20e 1f8b ec83 ec04 8cc0 8c46 fec7  X............F..
 0000290: 46fc ab00 0ee8 1300 8b46 fe8e c033 ffb9  F........F...3..
 00002a0: 0060 33c0 fcf3 ab8b e5eb 7455 8bec 8b46  .`3.......tU...F
-00002b0: 048e d8bb 0000 c687 0381 98e6 439a 8181  ............C...
+00002b0: 048e d8bb 0000 c687 8181 8181 8181 8181  ................
 00002c0: c687 0210 85be 0008 b1ff e85d 00fc 32e4  ...........]..2.
-00002d0: b100 e855 002e 8b0e 8181 8181 8181 8181  ...U............
-00002e0: 7523 c687 0410 0d2e 8b16 1c00 8181 8181  u#..............
-00002f0: 8814 8881 8181 8181 8198 e643 9a81 8181  ...........C....
+00002d0: b100 e855 002e 8b0e 8181 8181 8198 e643  ...U...........C
+00002e0: 7523 c687 0410 0d2e 8b16 1c00 9a81 8181  u#..............
+00002f0: 8814 8834 8198 e643 9a81 8181 8181 8181  ...4...C........
 0000300: 1009 e836 0084 870d 10ac 02e0 aa4e e2cc  ...6.........N..
 0000310: 2e3a 2620 0075 065d 0633 c050 cb5d cb07  .:& .u.].3.P.]..
 0000320: 1f5d 5f5e 5a59 5b58 9dcb c687 0410 0b88  .]_^ZY[X........
-0000330: 0cc6 871e 1000 c687 0410 09f6 8198 e643  ...............C
+0000330: 0cc6 871e 1000 c687 0410 09f6 8181 8181  ................
 0000340: f687 2010 80f6 8720 1080 f687 2010 80f6  .. .... .... ...
-0000350: 8704 1080 74f9 f687 2010 80f6 9a81 8181  ....t... .......
-0000360: c31c 0000 0000 0000 0000 0000 8100 0081  ................
-0000370: 0000 0000 8100 8181 8181 8181 8181 8181  ................
+0000350: 8704 1080 74f9 f687 2010 80f6 8181 8181  ....t... .......
+0000360: c31c 0000 0000 0000 0000 0000 0081 8181  ................
+0000370: 0000 0000 0000 0000 8181 98e6 439a 8181  ............C...
 0000380: 0000 0000 0000 0000 0000 0000 0000 0000  ................
 0000390: 0000 0000 0000 0000 0000 0000 0000 0000  ................
 00003a0: 0000 0000 0000 0000 0000 0000 0000 0000  ................
-00003b0: 0000 0000 0000 0000 8181 8181 98e6 439a  ..............C.
+00003b0: 0000 0000 0000 0000 8181 98e6 439a 8181  ............C...
 00003c0: 0000 0000 0000 0000 0000 0000 0000 0000  ................
-00003d0: 0000 0000 0000 0000 8181 8181 98e6 439a  ..............C.
+00003d0: 0000 0000 0000 0000 8181 8181 8181 8181  ................
 00003e0: 0000 0000 0000 0000 0000 0000 8181 8181  ................
-00003f0: 0000 8100 8181 8181 8181 8181 8181 8181  ................
+00003f0: 8181 0000 8181 8181 98e6 439a 8181 8181  ..........C.....
 0000400: 0000 0000 0000 0000 0000 0000 0000 0000  ................
 0000410: 0000 0000 0000 0000 0000 0000 0000 0000  ................
 0000420: 0000 0000 0000 0000 0000 0000 0000 0000  ................
===
that data was read by
===
                cmd(bios, NAND_CMD_READ0);
                adr(bios, page);
                doc_read_nop(bios);  /* nop between write/read */
                doc_write_cdsncontrol(bios, CDSN_CTRL_CE);
                doc_read(bios, ReadPipelineInitialization);
                for(i=0; i<512-1; i++) {
                        doc_read_4nop(bios);
                        doc_read(bios, CDSNSlowIO);
                        doc_read_4nop(bios);
                        buf[offset++] = doc_read(bios, _CDSNIO_BASE+i);
                        doc_read_4nop(bios);
                }
                buf[offset++] = doc_read(bios, LastDataRead);
                doc_write_cdsncontrol(bios, CDSN_CTRL_CE);
                if(doc_wait(bios, 5000)) {
                        printf("outch...\n");
                        return(-1);
                }
===
if i read without CDSNSlowIO and without doc_read_4nop(bios) then the result is
worse and more bits/bytes are different each read.
if i read doc_read(bios, _CDSNIO_BASE) (***check the missing ``+ i''***) then
i get 0x55 all the time (except for doc_read(bios, LastDataRead)).

all this is very strange and i am beginning to think
that my DoC (the flash in it) is damaged.

any idea?

niki w. waibel

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