Re: N900 device tree conversion: how to do first step

From: Pavel Machek
Date: Sun Jun 09 2013 - 12:47:58 EST

On Sun 2013-06-09 11:24:40, Pali Rohár wrote:
> On Sunday 09 June 2013 03:59:44 Pavel Machek wrote:
> > Hi!
> >
> > I'd like to convert Nokia N900 to device tree.
> >
> > Unfortunately, serial port is not easily available (very
> > special cable would be needed, does someone know where to get
> > one?) and I don't have BDI (and very special cable would be
> > needed, too).
> >
> Hello,
> I used serial port only in qemu for debugging. Maybe you can try
> to play with qemu first. Qemu has good n900 HW support.

Yes, qemu is helpful.

For the record: this is how you use it.

./qflasher -m rx51 -x ./xloader-qemu.bin -s ./secondary-qemu.bin -k $KERNEL -o n900.img -p k=6072

> sd-empty
./qemu-system-arm -s -M n900 -mtdblock n900.img -sd sd-empty -serial
stdio -clock unix -redir tcp:5555:

...and this patch is needed to make it past rx51_init.

Author: Pavel <pavel@xxxxxx>
Date: Sun Jun 9 18:45:39 2013 +0200

Comment out errata workaround that breaks qemu.

diff --git a/arch/arm/mach-omap2/board-rx51.c b/arch/arm/mach-omap2/board-rx51.c
index 938e46f..0ffd7d3 100644
--- a/arch/arm/mach-omap2/board-rx51.c
+++ b/arch/arm/mach-omap2/board-rx51.c
@@ -108,11 +108,13 @@ static void __init rx51_init(void)

+#if 0
#ifdef CONFIG_ARM_ERRATA_430973
printk(KERN_INFO "RX-51: Enabling ARM errata 430973 workaround.\n");
/* set IBE to 1 */
rx51_secure_update_aux_cr(1 << 6, 0);

/* Ensure SDRC pins are mux'd for self-refresh */
omap_mux_init_signal("sdrc_cke0", OMAP_PIN_OUTPUT);

(cesky, pictures)
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