Hi Eric,
On 11/12/2015 15:40, Eric Nelson wrote:
> 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)))
I fix it in V3 before Marek complains :-). I do not like yoda
conditions, too.
>> + 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:
ok, thanks.
>
>> +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>
>
Regards,
Stefano
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