Reserving different UARTs for DSP

Roberto6717

How can I reserve specific UARTs for DSP use so that Linux does not perform any configuration operations on these peripherals at startup. The UART I choose would not necessarily be uart2. So for example, I may want to reserve uart1 for DSP, but leave uart0 and uart2 for Linux use.

over 15 years ago

0 Sekhar Nori over 15 years ago

TI__Expert 6385 points

Hello,

The function davinci_serial_init() in arch/arm/mach-davinci/serial.c looks at a bitmask called "enabled_uarts" before initializing a UART. You can mark the UARTs you are not interested in controlling in Linux with a '0' in this mask.

This mask can be set from the board specific file (like arch/arm/mach-davinci/board-da830-evm.c).

Thanks,

Sekhar

0 Roberto6717 over 15 years ago in reply to Sekhar Nori

Prodigy 75 points

Is there anything that can be done to enable a uart that was disabled by this mask at powerup?

0 Sudhakar Rajashekhara over 15 years ago in reply to Roberto6717

TI__Expert 5170 points

Hi,

It is not possible to enable the UART after powerup, which are disabled using the masks mentioned above. Based on the mask, clocks will be enabled for UARTs during powerup and this cannot be done after the EVM is booted.

Regards, Sudhakar

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Reserving different UARTs for DSP