[FS#542] ipq806x: unable to boot linux-4.9.10 uboot seeing Bad Magic Number

[LEDE Bugs]

The following task has a new comment added:

FS#542 - ipq806x: unable to boot linux-4.9.10 uboot seeing Bad Magic Number
User who did this - dissent1 (dissent1)

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Thanks! We are stuck at it for almost a week already, seems kernel fails before serial driver attaches. Irq/clock/timer calibration failure?
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=542#comment1941