CODEWITHSUNDEEP
u-boot
user3693586
user3693586

Reputation: 1287

Usage of CONFIG_SYS_MAX_NAND_DEVICE macro in U-boot

I could see following macro definitions in IMX53 evk board config file(mx53_evk.h).

#define CONFIG_SYS_NAND_MAX_CHIPS     8
#define CONFIG_SYS_MAX_NAND_DEVICE    1

The CONFIG_SYS_NAND_MAX_CHIPS macro value defines no.of NAND chips we have on the board, but what is the usage of CONFIG_SYS_MAX_NAND_DEVICE macro. can you help me to understand. U-boot(2009.08) is using for IMX53 evk board.

Upvotes: 0

Views: 558

Answers (1)

Tom Rini
Tom Rini

Reputation: 2173

First, I assume that you're using a release from Freescale with patches for i.MX rather than the stock v2009.08 release. Aside from suggesting that you switch to mainline (i.MX5 is very well supported these days), I believe the answer here (based on a Freescale release I happen to have around) is that for that tree (and not mainline) you should set CONFIG_SYS_NAND_MAX_CHIPS to 8 (Freescale sets this to 8 everywhere) and CONFIG_SYS_MAX_NAND_DEVICE to the number that you have. This appears to be related to making a distinction in how the NAND chip itself works that is no longer done.

Upvotes: 1

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