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UM10362
NXP Semiconductors
Chapter 6: LPC314x ISROM/Boot ROM
Table 82.
Bad block list page
Field Name
Offset
Size in Description
bytes
page_size page_size page_size
512 byte
2048 byte 4096 byte
Page 1
Bad_block_list_size 0x00
0x00
0x00
4
Size of bad block list
Bad block number
0x04
0x04
0x04
4
First bad block number
Bad block number
0x08
0x08
0x08
4
Second bad block number
Marker
0x1F8
0x7F8
0xFF8
3
Bad page marker. This field should always be set as
ASCII string "BAD".
Bad_page_nr
0x1FB
0x7FB
0xFFB
1
Page number. Value = 1.
CRC32
0x1FC
0x7FC
0xFFC
4
CRC32 value of the current page excluding the current
word. I.e. CRC32 of bytes 0 to (page_size  4) of this
page.
Bad block number
0x00
0x00
0x00
4
Bad block number m, where m = page_size/4  3 + 1 =
126/510/1022 for page_size = 512/2048/4096 byte.
Bad block number
0x04
0x04
0x04
4
Bad block number m + 1.
Marker
0x1F8
0x7F8
0xFF8
3
Bad page marker. This field should always be set as
ASCII string "BAD".
Bad_page_nr
0x1FB
0x7FB
0xFFB
1
Page number. Value = 2.
CRC32
0x1FC
0x7FC
0xFFC
4
CRC32 value of the current page excluding the current
word, for example CRC32 of bytes 0 to 508 of this
page for a 512-byte page.
…
Page 2
…
Last bad block page n
Bad block number
0x00
0x00
0x00
4
Bad block number m + (n  2)  (m + 1), where
m = page_size/4  3 = 125/509/1021 byte.
Bad block number
0x04
0x04
0x04
4
Next bad block number
Marker
0x08
0x08
0x08
3
Bad page marker. This field should always be set as
ASCII string "BAD".
Bad_page_nr
0x0B
0x0B
0x0B
1
Page number. Value = n.
CRC32
0x0C
0x0C
0x0C
4
CRC32 value of the current page excluding the current
word. I.e. CRC32 of bytes 0 to 12 of this page.
In the above table, the assumption is made that the last bad block page contained only 2
bad block numbers. If the number of bad blocks is less than 125/509/1021 (for a
512/2048/4096-byte device), then the page 1 structure will be as shown in Table 6–83.
The boot ROM always reads one full page (512 byte for small, 2 kB or 4 kB for large)
before it parses the bad block list. If ECC is enabled in the parameter page, then the
NAND programmer should write the complete page, or else the ECC will fail on
subsequent sub-pages. The boot ROM will treat this as an error and not boot from NAND.
UM10362
User manual
© NXP B.V. 2012. All rights reserved.
Rev. 1 — 7 December 2012
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