How to modify pin mux configuration of OMAP4470?

Maggie Roxas

I have read that pin mux of OMAP4470 can be configured in x-loader, u-boot and kernel - but I want to configure it at u-boot level.

I turned off CONFIG_OMAP_MUX in kernel to use u-boot's pin mux configuration.

Then I modified board/omap4430sdp/omap4430sdp.c (I modeled config based on omap4430sdp_config).

Just to check if my u-boot modifications work, I modified I2C buses 2 and 3. I changed mode from I2C:

        MV(CP(I2C2_SCL),        (PTU | IEN | M0)) /* i2c2_scl */ \
        MV(CP(I2C2_SDA),        (PTU | IEN | M0)) /* i2c2_sda */ \
        MV(CP(I2C3_SCL),        (PTU | IEN | M0)) /* i2c3_scl */ \
        MV(CP(I2C3_SDA),        (PTU | IEN | M0)) /* i2c3_sda */ \

To GPIO:

        MV(CP(I2C2_SCL),        (PTU | IEN | M3)) /* gpio_128 */ \
        MV(CP(I2C2_SDA),        (PTU | IEN | M3)) /* gpio_129 */ \
        MV(CP(I2C3_SCL),        (PTU | IEN | M3)) /* gpio_130 */ \
        MV(CP(I2C3_SDA),        (PTU | IEN | M3)) /* gpio_131 */ \

To verify if my changes worked (expected behavior is that I can't probe it anymore), at u-boot level, I tried to see if I can still "probe" the devices connected at buses I2C 2 and 3.

But I can still probe the devices connected at I2C buses 2 and 3, so it seems like my modifications are not working.

Am I missing something?

Note: I can boot up to android user space level.

over 11 years ago

0 Maggie Roxas over 11 years ago

Prodigy 250 points

Just checked that in u-boot's ./cpu/omap4/omap4.c, set_muxconf_regs() is not called:

        /* Clock and Mux configerations is already done in x-loader */
        if(!in_sdram) {
                set_muxconf_regs();
                delay(100);
                prcm_init();
        }

It seems like u-boot pin mux setting is not used, and it just uses pin mux setting of x-loader.

So I just modified x-loader's board/omap4430sdp/omap4430sdp.c.

Pin mux is changed after that.

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How to modify pin mux configuration of OMAP4470?