* [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? -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.busybox.net/pipermail/buildroot/attachments/20140212/c5dfdfc5/attachment.html> ^ 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 ?? 2014-02-12 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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[not found] <52F9F84E020000460004A7CD@gwia2.rz.hs-offenburg.de>
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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