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AM335x ROM Bootloader Pin-Mux

Patrick Ruf
Genius 5075 points

Hi,

I use a AMM35x ICE board (1.0A). I have deleted the SPI flash as well as the NOR flash to make shure there is no second level booloader code active. If I switch-on the board the LED D4 is on (green and red). That means pin MDIO (M17) and MDC (M18) must be in an active high state. From the boot sequence SPI0, MMC0, USB0 and then UART0 I expect that MDIO and MDC pins stay in the initial state (Mux value 7). After connecting with CCS I can see that "con_mdc" register and "conf_mdio" register both have a value of 0 in the mux mode (bit0...2). That means the ROM bootloader initialize peripheral that is not used in the configured boot sequence (SYSBOOT pins).

a) Is that right?

b) If so, is there a document that tells how each pin is configured by the ROM bootloader?

Thanks and best regards,
Patrick