NXP used to setup the gpmi clock root from gpmi_clk in early versions in their downstream BSP. [1] However on mainline the gpmi clock root was always setup from enfc since the beginning of the i.MX 6 series SoCs, which is still the same today. [2] NXP followed the mainline approach at some point and changed setup_gpmi_io_clk to setup gpmi clock root from enfc which left faulty code behind in our board file. [3] This commit follows the change of NXP as it improves the performance of the NAND from ~1.2 MiB/s to ~12 MiB/s. [3] This change was verified to work in recovery-mode and u-boot loaded from NAND on all four Colibri iMX6ULL SKUs from Toradex. The frequency used to read the NAND, measured on RE# (Read Enable): before this patch: 1.4 MHz after this patch: 22 MHz in Linux Kernel: 50 MHz [1] https://source.codeaurora.org/external/imx/uboot-imx/tree/arch/arm/cpu/armv7... [2] commit 23608e23fd65 ("i.mx: add the initial support for freescale i.MX6Q processor") [3] https://source.codeaurora.org/external/imx/uboot-imx/commit/?id=7a82a19ceabf... Signed-off-by: Philippe Schenker philippe.schenker@toradex.com
Applied to u-boot-imx, master, thanks !
Best regards, Stefano Babic