[i.MX6ULL] NAND boot: Search Stride and Search Count

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[i.MX6ULL] NAND boot: Search Stride and Search Count

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Contributor III

IMX6ULLRM.pdf, page 273, figure 8-5.

Current Page = 0,
Search Stride = Stride Size Fuse Value,
Search Count = Boot Search Count Fuse Value

Where do I find these particular fuses? Table 5-7 on page 225 notes "Boot Seach Count" in BOOT_CFG2, but I couldn't find the "Stride Size" fuse.

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NXP TechSupport
NXP TechSupport

the stride size is usually the pages in each block which comes from the boot configuration ( the value comes from external boot pins or fuse box when you are booting from fuse).

 

the configuration pins are: CFG2_1 and CFG2_2

 

Pages In Block:

    00 - 128

    01 - 64

    10 - 32

    11 - 256

 

"The search area contains copies of the FCB at each stride distance, so in case the first

NAND block becomes corrupted, the ROM will find its copy in the next NAND block.

The search area should span over at least two NAND blocks."

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NXP TechSupport
NXP TechSupport

Please refer to Table 8_10  page 270  of the i.MX6ULLRM 

The values are :

00—2
01—2
10—4
11—8

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