Re: [PATCH V3 2/4] ARM64 LPC: LPC driver implementation on Hip06

From: John Garry
Date: Thu Oct 06 2016 - 09:33:03 EST

On 06/10/2016 01:18, Benjamin Herrenschmidt wrote:
On Tue, 2016-10-04 at 13:02 +0100, John Garry wrote:
Right, so I think Zhichang can make the necessary generic changes to
8250 OF driver to support IO port as well as MMIO-based.

However an LPC-based earlycon driver is still required.

A note on hip07-based D05 (for those unaware): this does not use
LPC-based uart. It uses PL011. The hardware guys have managed some
trickery where they loopback the serial line around the BMC/CPLD. But we
still need it for hip06 D03 and any other boards which want to use LPC
bus for uart.

A question on SBSA: does it propose how to provide serial via BMC for SOL?

Probably another reason to keep 8250 as a legal option ... The (very
popular) Aspeed BMCs tend to do this via a 8250-looking virtual UART on


I think we're talking about the same thing for our LPC-based UART.