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Up until now cpu clock gets initialized at 384 MHz, which is the highest supported cpu clock. Recent A20 batches show an increased percentage of modules reacting very sensitive to operating conditions outside the specifications. The cpu dies very shortly after PLLs, core frequency or cpu voltage are missconfigured. E.g.: - uboot SPL selects 384 MHz as cpu clock which requires a cpu voltage of at least 1.1 V. - Linux CPU Frequency scaling with most sun7i dts will reduce cpu voltage down to 1.0 V. - When intiating a reboot or reset from linux the cpu voltage may keep the 1.0 V configuration and the cpu dies during SPL initialization. Therefore reduce cpu clock at uboot SPL initialization down to 144 MHz from 384 MHz. Use patch until KConfig option in uboot becomes available. Signed-off-by: Ludwig Kormann <ludwig.kormann@ict42.de> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Buildroot is a simple, efficient and easy-to-use tool to generate embedded Linux systems through cross-compilation. The documentation can be found in docs/manual. You can generate a text document with 'make manual-text' and read output/docs/manual/manual.text. Online documentation can be found at http://buildroot.org/docs.html To build and use the buildroot stuff, do the following: 1) run 'make menuconfig' 2) select the target architecture and the packages you wish to compile 3) run 'make' 4) wait while it compiles 5) find the kernel, bootloader, root filesystem, etc. in output/images You do not need to be root to build or run buildroot. Have fun! Buildroot comes with a basic configuration for a number of boards. Run 'make list-defconfigs' to view the list of provided configurations. Please feed suggestions, bug reports, insults, and bribes back to the buildroot mailing list: buildroot@buildroot.org You can also find us on #buildroot on OFTC IRC. If you would like to contribute patches, please read https://buildroot.org/manual.html#submitting-patches