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Date: Fri, 19 Dec 2008 00:30:34 -0800 (PST)
From: Felix Radensky <felix@embedded-sol.com>
To: linuxppc-dev@ozlabs.org
Subject: Re: Long boot delay on 460EX with 2.6.28-rc8
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Stefan Roese wrote:
> 
> 
>> Is this an expected behavior - detection of 256 MiB NAND flash
>> takes around 20 seconds. The ndfc driver works fine after boot.
> 
> No, 20 seconds is definitely too long. Something must be wrong with the
> ndfc 
> driver or the NAND dts entries.
> 
> Best regards,
> Stefan
> _______________________________________________
> Linuxppc-dev mailing list
> Linuxppc-dev@ozlabs.org
> https://ozlabs.org/mailman/listinfo/linuxppc-dev
> 

Thanks, Stefan

My ndfc DTS entry looks like this

nand@3,0 {
    compatible = "amcc,ndfc";
    reg = <0x00000003 0x00000000 0x00002000>;
    ccr = <0x00001000>;
    bank-settings = <0x80002222>;
    #address-cells = <1>;
    #size-cells = <1>;

    partition@0 {
        label = "data";
        reg = <0x00000000 0x10000000>;
    };
};

I also had to modify u-boot to provide ndfc ebc mappings.
Not sure if it's the best solution, but it worked. Sorry for
posting u-boot stuff here, I'll stop doing that if list thinks
it's irrelevant.

My u-boot code looks like this (modified canyonlands code):

void ft_board_setup(void *blob, bd_t *bd)
{
        u32 val[8];
        int rc;

        ft_cpu_setup(blob, bd);

        /* Fixup NOR mapping */
        val[0] = 0;                             /* chip select number */
        val[1] = 0;                             /* always 0 */
        val[2] = CFG_FLASH_BASE_PHYS_L;         /* we fixed up this address
*/
        val[3] = gd->bd->bi_flashsize;

        /* Set NAND Controller mapping */
        val[4] = CFG_NAND_CS;                   /* chip select number */
        val[5] = 0;                                         /* always 0 */
        val[6] = CFG_NAND_ADDR;              /* NAND address */
        val[7] = 0x2000;                               /* NAND register area
size */

        rc = fdt_find_and_setprop(blob, "/plb/opb/ebc", "ranges",
                                  val, sizeof(val), 1);
        if (rc) {
                printf("Unable to update property NOR mapping, err=%s\n",
                       fdt_strerror(rc));
        }
}

Felix.

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