1U-Boot for Freescale i.MX5x 2 3This file contains information for the port of U-Boot to the Freescale 4i.MX5x SoCs. 5 61. CONFIGURATION OPTIONS/SETTINGS 7--------------------------------- 8 91.1 CONFIG_MX51_PLL_ERRATA: Workaround for i.MX51 PLL errata. 10 This option should be enabled by all boards using the i.MX51 silicon 11 version up until (including) 3.0 running at 800MHz. 12 The PLL's in the i.MX51 processor can go out of lock due to a metastable 13 condition in an analog flip-flop when used at high frequencies. 14 This workaround implements an undocumented feature in the PLL (dither 15 mode), which causes the effect of this failure to be much lower (in terms 16 of frequency deviation), avoiding system failure, or at least decreasing 17 the likelihood of system failure. 18