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From: Vipin KUMAR <vipin.kumar@st.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] 8/16 bit support for NAND at runtime
Date: Thu, 04 Mar 2010 16:02:31 +0530	[thread overview]
Message-ID: <4B8F8C3F.6050703@st.com> (raw)

Hi All,

This query is wrt NAND 8/16 bit device support at runtime. Currently,
the u-boot code can support only one of these at a time.

Although the NAND device in itself can be recognized by reading the
device id, the NAND controllers may need different platform specific
initializations for different device attached.

The current u-boot is written in such a way that
1. Initializes chip->options for a particular buswidth option
2. calls board_nand_init once and proceeds to read the device id

Although it matches the buswidth selected through chip->options and the
the buswidth of device id it reads and returns an error if they don't 
match, probably a better way can be to reinitialize NAND controller 
based on 16 bit device and re-read the device id.

This way both type of devices can be supported at runtime

Please let me know your opinion on this.
Please also let me know if I am missing something

Regards
Vipin

             reply	other threads:[~2010-03-04 10:32 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-03-04 10:32 Vipin KUMAR [this message]
2010-03-04 12:28 ` [U-Boot] 8/16 bit support for NAND at runtime Wolfgang Denk
2010-03-05  4:42   ` Vipin KUMAR
2010-03-21 16:50     ` Wolfgang Denk
2010-03-23  5:42       ` Swarthout Edward L-SWARTHOU
2010-03-23  5:54       ` Vipin KUMAR
2010-03-23 16:15 ` Scott Wood

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