[U-Boot] Between 2015.10 and 2016.01, SPI flash changed erase size, and saveenv stopped working

[Pavel Machek <pavel@denx.de>]

On Mon 2016-05-30 10:43:39, Fabio Estevam wrote:
> On Mon, May 30, 2016 at 5:33 AM, Pavel Machek <pavel@denx.de> wrote:
> 
> > Commit c3c016cf75360c2a0d0a065b64b438aaf7720576 is a part of the problem:
> >
> > offset 0x40000 is protected and cannot be erased
> > => sf help
> > No SPI flash selected. Please run `sf probe'
> > => sf probe
> > ...
> > SF: Detected N25Q512 with page size 256 Bytes, erase size 4 KiB, total
> > 64 MiB
> > cadence_spi_set_speed: speed=1000000
> > => sf protect unlock 0x40000 0x20000
> > cadence_spi_xfer: len=1 [bytes]
> > cadence_spi_xfer: len=1 [bytes]
> > => saveenv
> > Saving Environment to SPI Flash...
> 
> Does this quick hack help? I am wondering if yous SPI flash power up
> with the SR field protected:

This may be stupid but... is it possible that changes made by
write_sr() persist over powerdown?

Best regards,
									Pavel

> --- a/drivers/mtd/spi/spi_flash.c
> +++ b/drivers/mtd/spi/spi_flash.c
> @@ -1021,11 +1021,7 @@ int spi_flash_scan(struct spi_flash *flash)
>                 return -EPROTONOSUPPORT;
>         }
> 
> -       /* Flash powers up read-only, so clear BP# bits */
> -       if (idcode[0] == SPI_FLASH_CFI_MFR_ATMEL ||
> -           idcode[0] == SPI_FLASH_CFI_MFR_MACRONIX ||
> -           idcode[0] == SPI_FLASH_CFI_MFR_SST)
> -               write_sr(flash, 0);
> +       write_sr(flash, 0);
> 
>         /* Assign spi data */
>         flash->name = params->name;

-- 
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