Hi Stefano,
On 12/11/2015 06:40 AM, Stefano Babic wrote:
> Check for bmode before reading the boot device
> to check if a serial downloader is started,
> and returns UART if the serial downloader is set,
> letting SPL to wait for an image if
> CONFIG_SPL_YMODEM_SUPPORT is set.
>
> This allows to load again a SPL based board
> with imx_usb_loader together with a tool
> such as kermit.
>
> Signed-off-by: Stefano Babic <sba...@denx.de>
> CC: Tim Harvey <thar...@gateworks.com>
> CC: Fabio Estevam <fabio.este...@freescale.com>
> CC: Eric Nelson <eric.nel...@boundarydevices.com>
> ---
>
> Changes in v2:
> - Add documentation (S. Roese)
> - Check just bits 24-25 because reserved bits are set on some variants
> (E. Nelson)
> - Set boot device to UARt if USB is set to let bmode working as
> suggested by Eric
>
> arch/arm/imx-common/spl.c | 8 ++++++++
> doc/README.imx6 | 51
> +++++++++++++++++++++++++++++++++++++++++++++++
> 2 files changed, 59 insertions(+)
>
> diff --git a/arch/arm/imx-common/spl.c b/arch/arm/imx-common/spl.c
> index ac6e40e..a8f2492 100644
> --- a/arch/arm/imx-common/spl.c
> +++ b/arch/arm/imx-common/spl.c
> @@ -20,7 +20,15 @@ u32 spl_boot_device(void)
> struct src *psrc = (struct src *)SRC_BASE_ADDR;
> unsigned int gpr10_boot = readl(&psrc->gpr10) & (1 << 28);
> unsigned reg = gpr10_boot ? readl(&psrc->gpr9) : readl(&psrc->sbmr1);
> + unsigned int bmode = readl(&psrc->sbmr2);
>
> + /*
> + * Check for BMODE if serial downloader is enabled
> + * BOOT_MODE - see IMX6DQRM Table 8-1
> + */
> + if ((((bmode >> 24) & 0x03) == 0x01) || /* Serial Downloader */
I think Marek will have a problem with the yoda conditional:
> + (gpr10_boot && (1 == reg)))
> + return BOOT_DEVICE_UART;
> /* BOOT_CFG1[7:4] - see IMX6DQRM Table 8-8 */
> switch ((reg & 0x000000FF) >> 4) {
> /* EIM: See 8.5.1, Table 8-9 */
> diff --git a/doc/README.imx6 b/doc/README.imx6
> index 437af2f..5aa41f2 100644
> --- a/doc/README.imx6
> +++ b/doc/README.imx6
> @@ -84,3 +84,54 @@ Address:
> Reading bank 4:
>
> Word 0x00000002: 9f027772 00000004
> +
> +2. Using imx_usb_loader for first install with SPL
> +--------------------------------------------------
> +
> +imx_usb_loader is a very nice tool by BoundaryDevice that
> +allow to install U-Boot without a JTAG debugger, using
> +the USB boot mode as described in the manual. It is
> +a replacement for Freescale's MFGTOOLS.
> +
> +The sources can be found here:
> +
> + https://github.com/boundarydevices/imx_usb_loader.git
> +
> +Booting in USB mode, the i.MX6 announces itself to the Linux Host as:
> +
> +Bus 001 Device 111: ID 15a2:0061 Freescale Semiconductor, Inc.
> +
> +imx_usb_loader is able to download a single file (u-boot.imx)
> +to the board. For boards without SPL support, it is enough to
> +issue the command:
> +
> + sudo ../imx_usb_loader/imx_usb -v u-boot.imx
> +
s/requires to use two communications/requires two downloads/
> +Getting U-Boot when SPL support is active, it requires to use
> +two communications. imx_usb_loader downloads the SPL into
> +OCRAM and starts it. SPL will check for a valid u-boot.img, and
> +because it is not found, it will wait for it using the y-modem
> +protocol via the console.
> +
I think "by combining" would be clearer:
> +A first install is then possible combining imx_usb_loader with
> +another tool such as kermit.
> +
> +sudo ../imx_usb_loader/imx_usb -v SPL
> +kermit kermit_uboot
> +
> +and kermit_uboot contains something like this (set line should be adjusted):
> +
> +set line /dev/ttyUSB1
> +set speed 115200
> +SET CARRIER-WATCH OFF
> +set flow-control none
> +set handshake none
> +set prefixing all
> +set file type bin
> +set protocol ymodem
> +send u-boot.img
> +c
> +
> +The last "c" command tells kermit (from ckermit package in most distros)
> +to switch from command line mode to communication mode, and when the
> +script is finished, the U-Boot prompt is shown in the same shell.
>
By the way, besides the couple of nit-picks above, this documentation is
really nice!
Otherwise:
Reviewed-By: Eric Nelson <e...@nelint.com>
Tested-By: Eric Nelson <e...@nelint.com>
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