* [Buildroot] Antw: Re: Antw: Re: How to get the kernel to mount a rootfs without an initramfs ??
[not found] <52F9F84E020000460004A7CD@gwia2.rz.hs-offenburg.de>
@ 2014-02-11 9:53 ` Jeremy Rosen
2014-02-11 17:30 ` Arnout Vandecappelle
0 siblings, 1 reply; 4+ messages in thread
From: Jeremy Rosen @ 2014-02-11 9:53 UTC (permalink / raw)
To: buildroot
>
> the kernel panic message is the following:
>
> VFS: Cannot open root device "mmcblk0" or unknow-block(0,0) Please
> append a correct "root=" boot option; here are the available
> partitions: not syncing: VFS: Unable to mount root fs on
> unknown-block(0,0)
>
> As far as I know I have never partitioned the SD at all, so I don't
> think p1 is important then. Maybe it's easier if you can send me
> your command line , so I know what's the "truth" and look up what
> went wrong here
>
well, I don't understand where is your rootfs, then... do you have
a single partition on the SD ? you do need to have a partition
table afaik, even for a single partition.
Try to partition your SD card with a partition editor and then
adding the squashfs as the first partition
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Buildroot] Antw: Re: Antw: Re: How to get the kernel to mount a rootfs without an initramfs ??
2014-02-11 9:53 ` [Buildroot] Antw: Re: Antw: Re: How to get the kernel to mount a rootfs without an initramfs ?? Jeremy Rosen
@ 2014-02-11 17:30 ` Arnout Vandecappelle
2014-02-12 8:05 ` [Buildroot] Antw: " Frank Ihle
0 siblings, 1 reply; 4+ messages in thread
From: Arnout Vandecappelle @ 2014-02-11 17:30 UTC (permalink / raw)
To: buildroot
On 11/02/14 10:53, Jeremy Rosen wrote:
>>
>> the kernel panic message is the following:
>>
>> VFS: Cannot open root device "mmcblk0" or unknow-block(0,0) Please
>> append a correct "root=" boot option; here are the available
>> partitions: not syncing: VFS: Unable to mount root fs on
>> unknown-block(0,0)
Actually this sounds like you have no mmc driver in your kernel.
Regards,
Arnout
>>
>> As far as I know I have never partitioned the SD at all, so I don't
>> think p1 is important then. Maybe it's easier if you can send me
>> your command line , so I know what's the "truth" and look up what
>> went wrong here
>>
>
>
> well, I don't understand where is your rootfs, then... do you have
> a single partition on the SD ? you do need to have a partition
> table afaik, even for a single partition.
>
> Try to partition your SD card with a partition editor and then
> adding the squashfs as the first partition
> _______________________________________________
> buildroot mailing list
> buildroot at busybox.net
> http://lists.busybox.net/mailman/listinfo/buildroot
>
>
--
Arnout Vandecappelle arnout at mind be
Senior Embedded Software Architect +32-16-286500
Essensium/Mind http://www.mind.be
G.Geenslaan 9, 3001 Leuven, Belgium BE 872 984 063 RPR Leuven
LinkedIn profile: http://www.linkedin.com/in/arnoutvandecappelle
GPG fingerprint: 7CB5 E4CC 6C2E EFD4 6E3D A754 F963 ECAB 2450 2F1F
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Buildroot] Antw: Re: Antw: Re: Antw: Re: How to get the kernel to mount a rootfs without an initramfs ??
2014-02-11 17:30 ` Arnout Vandecappelle
@ 2014-02-12 8:05 ` Frank Ihle
2014-02-12 16:58 ` Arnout Vandecappelle
0 siblings, 1 reply; 4+ messages in thread
From: Frank Ihle @ 2014-02-12 8:05 UTC (permalink / raw)
To: buildroot
>Actually this sounds like you have no mmc driver in your kernel.
I'm using the defconfig where
in make linux-menuconfig is selected the following:
+Device Drivers
<*> MMC/SD/SDIO card support
+ + <*> MMC block device driver
+ + <*> MMC host test driver
+ + <*> Atmel SD/MMC Driver (Atmel Multimedia Card Interface support)
+ + [ * ] Atmel MCI DMA support (Exp.)
well but now, that you mention it, it's weired. When I do a bootable image with this settings but with initramfs and busybox as init system then I should be able to see which devices are detected, right? So If I do ls /dev/ mmcblk or sdb isn't even in the list, is that a normal behaviour?
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* [Buildroot] Antw: Re: Antw: Re: Antw: Re: How to get the kernel to mount a rootfs without an initramfs ??
2014-02-12 8:05 ` [Buildroot] Antw: " Frank Ihle
@ 2014-02-12 16:58 ` Arnout Vandecappelle
0 siblings, 0 replies; 4+ messages in thread
From: Arnout Vandecappelle @ 2014-02-12 16:58 UTC (permalink / raw)
To: buildroot
On 12/02/14 09:05, Frank Ihle wrote:
>>Actually this sounds like you have no mmc driver in your kernel.
>
> I'm using the defconfig where
>
> in make linux-menuconfig is selected the following:
>
> +Device Drivers
> <*> MMC/SD/SDIO card support
> + + <*> MMC block device driver
> + + <*> MMC host test driver
> + + <*> Atmel SD/MMC Driver (Atmel Multimedia Card Interface support)
> + + [ * ] Atmel MCI DMA support (Exp.)
>
> well but now, that you mention it, it's weired. When I do a bootable
> image with this settings but with initramfs and busybox as init system
> then I should be able to see which devices are detected, right? So If I
> do ls /dev/ mmcblk or sdb isn't even in the list, is that a normal behaviour?
No, it's not.
The platform bindings may be missing in your board file.
Which board are you building for? A standard board or a custom one? In
the latter case, you should check with your kernel developer where to
find the MMC device.
Regards,
Arnout
--
Arnout Vandecappelle arnout at mind be
Senior Embedded Software Architect +32-16-286500
Essensium/Mind http://www.mind.be
G.Geenslaan 9, 3001 Leuven, Belgium BE 872 984 063 RPR Leuven
LinkedIn profile: http://www.linkedin.com/in/arnoutvandecappelle
GPG fingerprint: 7CB5 E4CC 6C2E EFD4 6E3D A754 F963 ECAB 2450 2F1F
^ permalink raw reply [flat|nested] 4+ messages in thread
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2014-02-11 9:53 ` [Buildroot] Antw: Re: Antw: Re: How to get the kernel to mount a rootfs without an initramfs ?? Jeremy Rosen
2014-02-11 17:30 ` Arnout Vandecappelle
2014-02-12 8:05 ` [Buildroot] Antw: " Frank Ihle
2014-02-12 16:58 ` Arnout Vandecappelle
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