linux-kernel - Re: [Qemu-devel] Running linux on qemu omap

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Message-ID: <20190524185922.GA4597@t60.musicnaut.iki.fi>
Date:   Fri, 24 May 2019 21:59:22 +0300
From:   Aaro Koskinen <aaro.koskinen@....fi>
To:     Peter Maydell <peter.maydell@...aro.org>,
        Thomas Huth <thuth@...hat.com>
Cc:     Philippe Mathieu-Daudé <philmd@...hat.com>,
        Corentin Labbe <clabbe.montjoie@...il.com>,
        Tony Lindgren <tony@...mide.com>,
        Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
        QEMU Developers <qemu-devel@...gnu.org>,
        lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [Qemu-devel] Running linux on qemu omap

Hi,

On Fri, May 24, 2019 at 06:00:18PM +0300, Aaro Koskinen wrote:
> Please don't delete OMAP boards quite yet :) In the mainline kernel
> they are not orphaned, they frequently get tested using actual hardware,
> and QEMU would help in additional testing. I'll try to get N8x0 boot to
> work with the minimal kernel I use on real HW.

So it was only a matter of attaching the serial console at the QEMU side
(a hackish patch at the end of the mail).

$ qemu-system-arm --version
QEMU emulator version 4.0.0 (v4.0.0-dirty)
Copyright (c) 2003-2019 Fabrice Bellard and the QEMU Project developers
$ qemu-system-arm -M n810 -kernel zImage -nographic
Uncompressing Linux... done, booting the kernel.
[    0.000000] Booting Linux on physical CPU 0x0
[    0.000000] Linux version 5.1.0-n8x0_tiny-los_b1ac4+-00007-g7435e73d8ac4 (aaro@...-fx-6350) (gcc version 8.3.0 (GCC)) #1 Fri May 24 20:43:02 EEST 2019
[    0.000000] CPU: ARMv6-compatible processor [4107b362] revision 2 (ARMv6TEJ), cr=00c5387d
[    0.000000] CPU: VIPT aliasing data cache, unknown instruction cache
[    0.000000] OF: fdt: Machine model: Nokia N810
[    0.000000] printk: bootconsole [earlycon0] enabled
[    0.000000] Memory policy: Data cache writeback
[    0.000000] OMAP2420
[...]

However there are plenty of WARNs that are not present on real hardware.
Anyway, it's a start.

A.

...

diff --git a/hw/arm/nseries.c b/hw/arm/nseries.c
index 906b7ca22d43..52ff83ec5147 100644
--- a/hw/arm/nseries.c
+++ b/hw/arm/nseries.c
@@ -792,6 +792,7 @@ static void n8x0_uart_setup(struct n800_s *s)
     qdev_connect_gpio_out(s->mpu->gpio, N8X0_BT_WKUP_GPIO,
                     csrhci_pins_get(radio)[csrhci_pin_wakeup]);
 
+    omap_uart_attach(s->mpu->uart[2], serial_hd(0));
     omap_uart_attach(s->mpu->uart[BT_UART], radio);
 }