Dev June 2017

dev@lists.96boards.org

3 participants
3 discussions

by Daniel Thompson

Hi Folks I've ended up talking to a few people recently about LEDs. CE and EE have four user lights which are often hooked up in different ways on each board. Are there any common recommendations about default LED hook ups for the kernel (e.g. USR1 -> heartbeat, USR2 -> disk I/O, etc)? Similarly it might be useful to have a couple of events nominated where we recommend a firmware level bootloader[1] change LED status. Some examples: - Set USR1 on when bootloader starts up (a NOR/eMMC/SD is not empty light). - Set USR3 on when entering fastboot mode (if supported) - Set USR3 off when leaving fastboot mode, including via "fastboot boot" (if supported) - Set USR1 off and USR2, 3 and 4 on if bootloader panics. Especially for CE board (where users often don't have a UART adapter) even the above simple hints that the bootloader has been fetched from somewhere is useful. I know this can't be a rule, only "good advice" (like asking CE boards to put console on LS-UART1 if possible). However, is there any appetite to converge for the boards we have influence over? Daniel. [1] Here I definitely mean EDK2 rather than grub. If we have multiple chained firmware level bootloaders (e.g. LK -> u-boot) things are less clear although, as it happens, if *both* implemented the above proposal the results would still be perfectly useable from a user perspective.

5 years, 11 months

Re: [Dev] possible inconsistency in dragonboard HW user manual

by Amit Kucheria

(cc'ing the appropriate 96boards dev list) Hi Robert, On Sun, Jun 18, 2017 at 5:11 PM, Robert P. J. Day <rpjday(a)crashcourse.ca> wrote: > > not sure if this is the right list to point out oddities in the > documentation, but i'm reading this: > > https://www.96boards.org/db410c-getting-started/HardwareDocs/HWUserManual.m… > > and in the ToC, under "Low Speed Expansion Connector", there is no > mention of I2S, but in the very next section, "Introduction", under Actually, it says PCM/I2S, just like the specification. > "I/O Interfaces", one reads: > > One 40-pin Low Speed (LS) expansion connector > UART, SPI, I2S, I2C x2, GPIO x12, DC power > ^^^ > > should I2S be added to the ToC for consistency? or am i misreading > something? As per the spec, the LS connector must expose I2S/PCM. In other words, PCM data over I2S interface. In the pinout for the LS connector, the signals are named as PCM_FS, PCM_CLK, PCM_DO and PCM_DI on pins 16, 18, 20 and 22 respectively. The text under the introduction could be fixed to say I2S/PCM to be consistent with other parts of the documentation including the specification. Want to submit a patch to the documentation[1]? :-) Regards, Amit [1] https://github.com/96boards/documentation/

5 years, 11 months

[Post] AWS Livestream June 7th @ 17:30 UTC

by Robert Wolff

Watch Amazon Web Service executives, customers & partners bring you the latest in AWS IoT tech on Wednesday’s AWS IoT Livestream! http://amzn.to/2s1B6q5 <https://t.co/ZF7LnW7BVI> *For anyone who is interested.* -- *Robert Wolff* *OpenHours: *Countdown <http://www.96boards.org/openhours> *Social:* Linkedin <https://www.linkedin.com/in/sdrobertw> | MyTwitter <https://twitter.com/sdrobertw> | 96Twitter <https://twitter.com/96Boards> *Cell:* (619) 931 4558 *IRC Channels:* #96Boards #linaro #OpenHours *IRC Handle:* sdrobertw

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Dev June 2017