linux-kernel - Re: Nemo on emulated Nokia n900 (qemu-arm)

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Message-ID: <529C8A83.50003@codeaurora.org>
Date:	Mon, 02 Dec 2013 08:26:27 -0500
From:	Christopher Covington <cov@...eaurora.org>
To:	Pavel Machek <pavel@....cz>
CC:	pali.rohar@...il.com, sre@...ian.org, sre@...g0.de,
	kernel list <linux-kernel@...r.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	OH@....pavel.ucw.cz
Subject: Re: Nemo on emulated Nokia n900 (qemu-arm)

Hi Pavel,

On 11/28/2013 12:11 PM, Pavel Machek wrote:
> Hi!
> 
> For testing, it would be good to have some real
> userland... unfortunately I can't figure out how to do it.
> 
> Ideally, I'd like to put nemo-armv7hl-n900-mmcblk0p.raw on emulated sd
> card, but I get:
> 
> [    1.566345] Initializing XFRM netlink socket
> [    1.568023] NET: Registered protocol family 17
> [    1.570220] NET: Registered protocol family 15
> [    1.572601] Key type dns_resolver registered
> [    1.581481] omap_vp_forceupdate_scale: vdd_mpu_iva TRANXDONE
> timeout exceeded while trying to clear the TRANXDONE status
> [    1.586242] omap_vp_forceupdate_scale: vdd_core TRANXDONE timeout
> exceeded while trying to clear the TRANXDONE status
> [    1.601074] omap_vp_forceupdate_scale: vdd_mpu_iva TRANXDONE
> timeout exceeded. Voltage change aborted
> [    1.604522] cpu cpu0: omap_target: unable to scale voltage up.
> [    1.606933] omap_hsmmc omap_hsmmc.1: no support for card's volts
> [    1.609252] mmc1: error -22 whilst initialising SDIO card
> SD: ACMD41 in a wrong state
> SD: ACMD41 in a wrong state
> SD: ACMD41 in a wrong state
> SD: ACMD41 in a wrong state
> SD: CMD1 in a wrong state
> [    1.613830] cpufreq: __cpufreq_driver_target: Failed to change cpu
> frequency: -110
> [    1.622650] ThumbEE CPU extension supported.
> 
> But according to google, old linux kernels were able to work with SD
> on qemu-arm...
> 
> IIRC there was some discussion that qemu does not properly emulate SD
> card, and that internal NAND emulation can be used instead. I tried
> using qflasher, but it is not able to use 3.5GB
> nemo-armv7hl-n900-mmcblk0p.rawnemo-armv7hl-n900-mmcblk0p.raw -- strace
> revealed file too big error.
> 
> Any ideas?

While I don't know the details of QEMU SD/MMC and NAND support, another option
you could try is the VirtIO block device peripheral.

http://www.linux-kvm.org/page/Boot_from_virtio_block_device

Regards,
Christopher

-- 
Employee of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
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