On Thu, Jan 14, 2016 at 11:31 AM, Tom Rini <tr...@konsulko.com> wrote:
> On Mon, Jan 11, 2016 at 09:59:18AM -0700, Simon Glass wrote: > > Hi Craig, > > > > On 20 December 2015 at 19:07, Craig McQueen > > <craig.mcqu...@innerrange.com> wrote: > > > This is to avoid the boot sequence halting due to initial "junk" > > > received on serial input. > > > > > > Signed-off-by: Craig McQueen <craig.mcqu...@innerrange.com> > > > --- > > > I have found that on the BeagleBone Black, U-Boot occasionally halts at > > > the U-Boot prompt at boot-up, whether power-up, warm external > > > reset or software reset. I have seen other people report the same > issue. > > > > > > This seems to be due to U-Boot receiving "junk" data on the serial > > > console. The BeagleBone Black has a pull-down resistor which was > > > apparently added to try to mitigate this issue, but it doesn't entirely > > > fix it. > > > > I wonder if this can be fixed for that board only? > > No, and it's not -exactly- a that board only problem. It's a HW design > issue that can show up elsewhere too. I _think_ however in this case > the answer would be to migrate to perhaps CONFIG_AUTOBOOT_KEYED_CTRLC as > that's one of the reason various other boards use that set of options. > > I would suggest bringing this up on the beaglebone list to see what the > various people that ship and support these boards think, thanks! > I actually enabled this feature this week by default for beagleboard.org: diff --git a/configs/am335x_evm_defconfig b/configs/am335x_evm_defconfig index 27cb881..8699953 100644 --- a/configs/am335x_evm_defconfig +++ b/configs/am335x_evm_defconfig @@ -3,7 +3,10 @@ CONFIG_TARGET_AM335X_EVM=y CONFIG_SPL_STACK_R_ADDR=0x82000000 CONFIG_SPL=y CONFIG_SPL_STACK_R=y -CONFIG_SYS_EXTRA_OPTIONS="NAND" +CONFIG_AUTOBOOT_KEYED=y +CONFIG_AUTOBOOT_PROMPT="Press SPACE to abort autoboot in %d seconds\n" +CONFIG_AUTOBOOT_DELAY_STR="d" +CONFIG_AUTOBOOT_STOP_STR=" " # CONFIG_CMD_IMLS is not set # CONFIG_CMD_FLASH is not set CONFIG_CMD_GPIO=y It'll take time to replace older images but on target users can just: cd /opt/scripts/tools/developers/ git pull sudo ./update_bootloader.sh U-Boot SPL 2016.01-00001-g4eb802e (Jan 13 2016 - 11:14:31) Trying to boot from MMC bad magic U-Boot 2016.01-00001-g4eb802e (Jan 13 2016 - 11:14:31 -0600), Build: jenkins-github_Bootloader-Builder-313 Watchdog enabled I2C: ready DRAM: 512 MiB Reset Source: Global external warm reset has occurred. Reset Source: Power-on reset has occurred. MMC: OMAP SD/MMC: 0, OMAP SD/MMC: 1 Using default environment Net: <ethaddr> not set. Validating first E-fuse MAC cpsw, usb_ether Press SPACE to abort autoboot in 2 seconds => Regards, -- Robert Nelson https://rcn-ee.com/ _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot