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user/imxrt: Add notes about problems with EVB

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There are some possible problems with the i.MXRT1050 evaluation board.
Make some notes about that in the BSP manual.
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Christian Mauderer 2021-07-15 15:31:17 +02:00
parent 18746fb259
commit 238b48f9f8
1 changed files with 9 additions and 0 deletions
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user/bsps/arm/imxrt.rst
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@ -10,6 +10,10 @@ This BSP offers only one variant, the `imxrt1052`. This variant supports the
i.MXRT 1052 processor on a IMXRT1050-EVKB (tested with rev A1). You can also
configure it to work with custom boards.
NOTE: The IMXRT1050-EVKB has an backlight controller that must not be enabled
without load. Make sure to either attach a load, disable it by software or
disable it by removing the 0-Ohm resistor on it's input.
Build Configuration Options
---------------------------
@ -41,6 +45,11 @@ Then just copy the generated binary to the mass storage provided by the
debugger. Wait a bit till the mass storage vanishes and re-appears. After that,
reset the board and the newly programmed application will start.
NOTE: It seems that there is a bug on at least some of the on board debuggers.
They can't write more than 1MB to the HyperFlash. If your application is bigger
than that (like quite some of the applications in libbsd), you should use an
external debugger or find some alternative programming method.
For debugging: Create a special application with a `while(true)` loop at end of
`bsp_start_hook_1`. Load that application into flash. Then remove the loop
again, build your BSP for SDRAM and use a debugger to load the application into