[U-Boot] [4/5]devkit8000 nand_spl: Add SPL NAND support to omap_gpmc driver

[Simon Schwarz]

Dear Andreas,

> You also set some special ECC handling in this patch, please honour this
> in your commit message!
will do.

>> +
>> +/**
>> + * nand_read_buf16 - [DEFAULT] read chip data into buffer
>> + * @mtd:    MTD device structure
>> + * @buf:    buffer to store date
>> + * @len:    number of bytes to read
>> + *
>> + * Default read function for 16bit buswith
>> + *
>> + * This function is based on nand_read_buf16 from nand_base.c. This version
>> + * reads 32bit not 16bit although the bus only has 16bit.
>> + */
>> +static void gpmc_read_buf16(struct mtd_info *mtd, uint8_t *buf, int len)
>> +{
>> +     int i;
>> +     struct nand_chip *chip = mtd->priv;
>> +     u32 *p = (u32 *) buf;
>> +     len >>= 2;
>> +
>> +     for (i = 0; i < len; i++)
>> +             p[i] = readl(chip->IO_ADDR_R);
>> +}
>> +#endif
>> +
>>  /*
>>   * omap_hwecc_init - Initialize the Hardware ECC for NAND flash in
>>   *                   GPMC controller
>> @@ -278,7 +312,9 @@ void omap_nand_switch_ecc(int32_t hardware)
>>       /* Update NAND handling after ECC mode switch */
>>       nand_scan_tail(mtd);
>>
>> +     #ifndef CONFIG_SPL
>>       nand->options &= ~NAND_OWN_BUFFERS;
>> +     #endif
>>  }
>>
>>  /*
>> @@ -337,8 +373,23 @@ int board_nand_init(struct nand_chip *nand)
>>               nand->options |= NAND_BUSWIDTH_16;
>>
>>       nand->chip_delay = 100;
>> +     nand->dev_ready = omap_dev_ready;
>>       /* Default ECC mode */
>> +#ifndef CONFIG_PRELOADER
>
> should't this some CONFIG_USE_SOFT_ECC (or whatever config variable
> define that behaviour)?

Its the default ECC setting this is software for standard U-Boot. Just
for the Preloader it is HW. So i think using CONFIG_PRELOADER is ok
here.


>> +     nand->ecc.size = 512;
>> +     nand->ecc.bytes = 24;
>
> Ouch, these two values are extremely HW spwcific and need to be
> configurable then.
will change.

>
>> +     nand->ecc.hwctl = omap_enable_hwecc;
>> +     nand->ecc.correct = omap_correct_data;
>> +     nand->ecc.calculate = omap_calculate_ecc;
>
> Isn't that some kind of CONFIG_NAND_BUSWDITH (or whatever config
> variable define that behaviour) related setting?
Sorry don't understand that. These three functions are not related to
the bus width IMHO.

Thank you for the feedback!
Simon