Hi, I've been running two Marvell A3720 devices with CPU frequency scaling
enabled and 1.2Ghz enabled for several months without issues. In order to do
this I had to patch the DDR initialization code in Marvell's repos
(https://github.com/MarvellEmbeddedProcessors/mv-ddr-marvell/pull/44).
Without that patch, the device would indeed crash with frequency scaling
enabled at any clock speed. This indicates that at least some of the stability
issues experienced by users in the past are a result of improperly configured
bootloaders rather than an issue with the kernel. As a result, it seems
reasonable to re-enable the 1.2Ghz clock speed for users.
Ben