Skip to content
Snippets Groups Projects
Normal view Permalink
README.imx5 786 B
Newer Older
  • Learn to ignore specific revisions
    • David Jander's avatar
    ARM: MX51: PLL errata workaround
    David Jander committed
    1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 
    U-Boot for Freescale i.MX5x

This file contains information for the port of U-Boot to the Freescale
i.MX5x SoCs.

1. CONFIGURATION OPTIONS/SETTINGS
---------------------------------

1.1 CONFIG_MX51_PLL_ERRATA: Workaround for i.MX51 PLL errata.
    This option should be enabled by all boards using the i.MX51 silicon
    version up until (including) 3.0 running at 800MHz.
    The PLL's in the i.MX51 processor can go out of lock due to a metastable
    condition in an analog flip-flop when used at high frequencies.
    This workaround implements an undocumented feature in the PLL (dither
    mode), which causes the effect of this failure to be much lower (in terms
    of frequency deviation), avoiding system failure, or at least decreasing
    the likelihood of system failure.