Once a peripheral is pinmuxed in U-Boot does it need to be re-pinmuxed in Linux?

Sean Machin

I have modified the TI shipped U-Boot code to initialize a number of peripherals such as MMC, UARTS, Ethernet etc. at startup. Once a peripheral has it's pinmux settings configured in U-boot is that sufficient for the device to then be recognized in Linux? Or does a separate round of pinmux configuration need to be done in the Linux startup code?

over 12 years ago

0 Miroslav Kiradzhiyski XID over 12 years ago

TI__Mastermind 25235 points

Hi Sean,

Take a look at the <linux_folder>/arch/arm/mach-omap2/board-am335xevm.c board config file, where the pinmuxing for Linux is done. Check if some of your pinmuxing from U-Boot is overwritten and correct this accordingly.

Best regards,
Miroslav

0 Gururaja Hebbar over 12 years ago

TI__Intellectual 2725 points

If the pin-mux is set properly in u-boot, re-configuration in linux is not required. It is done in Mainline Linux, sa as to keep it independent of the bootloader.

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Once a peripheral is pinmuxed in U-Boot does it need to be re-pinmuxed in Linux?