[U-Boot] Reading from NAND

[D Kesselring]

I understand about scripting. I am trying to implement some somewhat
involved logic that walks a table of valid images. I am not convinced
that the u-boot scripting is sufficient for it. This table is an array
of structs. I need a loop that looks at a struct and determine if it
is valid and then do a couple of setenv.
Nand is working fine. I can execute the nand commands from the command
line without problems.
If you have any insights please let me know.
David

On Fri, Feb 18, 2011 at 1:54 PM, Scott Wood <scottwood at freescale.com> wrote:
> On Fri, 18 Feb 2011 08:29:45 -0500
> D Kesselring <kesselringd at gmail.com> wrote:
>
>> Hello,
>> I am trying to add some code to U-Boot that will read a NAND location
>> to determine how to setup some environment variables. I am using a
>> LogicPD SOM board with an OMAP3503 (very similar to Zoom). I have
>> found the code that handles the user nand commands and am trying to
>> use ‘nand_read_skip_bad’.  This needs a ‘nand_info_t*’ which I was
>> trying to get from the global ‘nand_info[]’ but it does not seem to be
>> initialized. My questions are (1) is the the best way to do this and
>> (2) if so, how do I get ‘nand_info[]’ initialized.
>
> As Wolfgang pointed out, the best way is probably using scripting (and
> certainly not by hacking up main_loop()), and thus you won't be calling
> nand_raed_skip_bad() directly.  But that still requires NAND to have been
> initialized.
>
> You need a NAND controller driver.  This driver supplies board_nand_init(),
> or in some cases may be called by board_nand_init() that platform code
> supplies.
>
> I'm not familiar with OMAP chips, but perhaps drivers/mtd/nand/omap_gpmc.c
> is the driver you want?  In which case your board config file needs to
> define CONFIG_NAND_OMAP_GPMC, as well as any driver-specific defines there
> may be.
>
> -Scott
>
>



-- 
W. David Kesselring
919-349-1079