From 40f4839ce12adfc0223d6e3035cf9c3a4754a0ec Mon Sep 17 00:00:00 2001 From: Stefano Babic Date: Fri, 11 Dec 2015 17:30:42 +0100 Subject: imx_common: check for Serial Downloader in spl_boot_device 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 CC: Tim Harvey CC: Fabio Estevam CC: Eric Nelson Reviewed-by: Eric Nelson Tested-by: Eric Nelson --- doc/README.imx6 | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) (limited to 'doc/README.imx6') diff --git a/doc/README.imx6 b/doc/README.imx6 index 437af2f..e26ab71 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 + +Getting U-Boot when SPL support is active, it requires +two downloads. 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. + +A first install is then possible by 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. -- cgit v1.1