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pico-imx7d: README: Recommend the usage of a USB hub

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Since commit 9e3c0174da ("pico-imx7d: Add LCD support") we started to
notice some hangs in U-Boot.

There is not an issue on such commit per se, but due to the LCD support
the current drawn is increased and this may cause issues when powering
pico-imx7d-pi from USB.

Some computers may be a bit strict with USB current draw and will
shut down their ports if the draw is too high.

The solution for that is to use an externally powered USB hub between the
board and the host computer.

Add such recommendation to the README file.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
This commit is contained in:
Fabio Estevam 2019-03-27 20:03:39 -03:00 committed by Stefano Babic
parent 40ee163cc4
commit 00102ae520
1 changed files with 4 additions and 0 deletions
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4
board/technexion/pico-imx7d/README
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@ -26,6 +26,10 @@ Connect a USB to serial adapter between the host PC and pico.
Connect a USB cable between the OTG pico port and the host PC.
Note: Some computers may be a bit strict with USB current draw and will
shut down their ports if the draw is too high. The solution for that is
to use an externally powered USB hub between the board and the host computer.
Open a terminal program such as minicom.
Copy SPL and u-boot.img to the imx_usb_loader folder.