On 1 October 2014 20:43, Stefan Roese <s...@denx.de> wrote:
> This is needed for the SoCFPGA booting from SPI NOR flash
> e.g. (N25Q256A). With these changes, the SoCrates can boot and
> re-boot (reset) from SPI NOR flash without any problems.
>
> Signed-off-by: Stefan Roese <s...@denx.de>
> Cc: Chin Liang See <cl...@altera.com>
> Cc: Dinh Nguyen <dingu...@altera.com>
> Cc: Vince Bridgers <vbrid...@altera.com>
> Cc: Marek Vasut <ma...@denx.de>
> Cc: Pavel Machek <pa...@denx.de>
> Cc: Michael Trimarchi <mich...@amarulasolutions.com>
> Cc: Jagannadha Sutradharudu Teki <jagannadh.t...@gmail.com>
> ---
> drivers/mtd/spi/sf_probe.c | 31 +++++++++++++++++++++++++++++++
> 1 file changed, 31 insertions(+)
>
> diff --git a/drivers/mtd/spi/sf_probe.c b/drivers/mtd/spi/sf_probe.c
> index 4d148d1..85b2677 100644
> --- a/drivers/mtd/spi/sf_probe.c
> +++ b/drivers/mtd/spi/sf_probe.c
> @@ -355,6 +355,37 @@ static struct spi_flash *spi_flash_probe_slave(struct
> spi_slave *spi)
> }
> }
>
> +#ifdef CONFIG_SPI_N25Q256A_RESET
> +#define CMD_RESET_ENABLE 0x66
> +#define CMD_RESET_MEMORY 0x99
> + /*
> + * This is needed for the SoCFPGA booting from SPI NOR flash
> + * e.g. (N25Q256A). Additionally its necessary to change
> + * this line in the Linux SPI NOR flash driver:
> + *
> + * { "n25q256a", INFO(0x20ba19, 0, 64 * 1024, 512,
> + * SECT_4K | SHUTDOWN_3BYTE) },
> + *
> + * Add SHUTDOWN_3BYTE here.
> + *
> + * With these changes, the SoCrates can boot and re-boot
> + * (reset) from SPI NOR flash without any problems.
> + */
> + ret = spi_flash_cmd(spi, CMD_RESET_ENABLE, NULL, 0);
> + if (ret) {
> + printf("SF: Failed issue reset command\n");
> + goto err_read_id;
> + }
> +
> + ret = spi_flash_cmd(spi, CMD_RESET_MEMORY, NULL, 0);
> + if (ret) {
> + printf("SF: Failed issue reset command\n");
> + goto err_read_id;
> + }
> +
> + printf("SF: Device software reset\n");
> +#endif
I have tested N25Q256A on zynq, couldn't encounter this either.
This seems to be SPI flash logic more hardwired to N25Q256A.
Any comments?
> +
> #ifdef CONFIG_OF_CONTROL
> if (spi_flash_decode_fdt(gd->fdt_blob, flash)) {
> debug("SF: FDT decode error\n");
> --
> 2.1.1
>
thanks!
--
Jagan.
_______________________________________________
U-Boot mailing list
U-Boot@lists.denx.de
http://lists.denx.de/mailman/listinfo/u-boot
