| 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 |
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| |
| 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. |