Thanks Marc and Kyösti for your hints. As I'm just discovering coreboot and its multiple possibilities, please apologize if my questions seems "too simple"... ;-) A) UART Type ------------------- From Kconfig file in ./src/drivers/uart, the valid ID for the oxpcie is 1415:c158. I can obtain this ID on my Startech board only when I strapped it as "native UART" (Startech documentation), that is : memory-mapped. From Kconfig file in ./src/console, there is following sentence : "Supporting multiple different types of UARTs in one build is not supported.". Q: Am I correct if I translate this like : "Use only memory-mapped or IO-mapped UARTs, but not both at the same time." ? B) Memory-mapped UART required options -------------------------------------------------------------- From the answers received, I would say that the required options (in make menuconfig) would be: - In "Generic Drivers": validate Oxford OXPCIe952 and de-validate "Serial Port on SuperIO". - In "Devices": Set the device and function numbers of the PCie bridge, behind which is connected the Startech board. On Mohon Peak, it's D1-F0. Q: What about the MMIO window base ? Is it the memory address of the UARTs, defined by the values in the BAR registers ? - in "Console": Validate "Serial Port Console Output". Q: What about the index of the "Serial Port console output" ? IMHO, there are only valid for IO-mapped UART. Correct ? Q: Am I missing anything ? Thanks in advance for the time you want to spent on it. Regards, Patrick Le 06/03/2015 19:01, Marc Jones a écrit :

Hi Patrick,

You can look at the Oxford pcie card and 8250MEM drivers for reference: src/drivers/uart/oxpcie* src/drivers/uart/uart8250mem*

Marc

On Fri, Mar 6, 2015 at 9:37 AM Patrick Agrain <patrick.agrain@alcatel-lucent.com <mailto:patrick.agrain@alcatel-lucent.com>> wrote:

Hello everybody,

Do you think that it would be possible to output the console messages from coreboot (seabios) on another UART port (strapped to be visible on Memory-based space or IO Space) connected on a PCIe slot ?

I've purchased a StarTech UART board with an OXPCIe952 chip, with the same IDs as visible in ./src/drivers/uart/oxpcie.c.

On http://www.coreboot.org/Serial_console#PCIe.2FMini_PCIe_based_serial_cards, what is behind the sentence: "In order to use the card for romstage debugging, minimal setup of the PCIe bridge and the MPEX2S952 have to be added to romstage.c" ?

Thanks in advance. Best regards, Patrick Agrain

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