This problem has prevented working releases for Linaro 2011.07 and 08 so
it would be great to have this fixed for 09.
I believe the problem here is that the mmc driver is not getting
initialized. If I understand things correctly, there are two possible
ways for this driver to get probed. It either needs to be a platform
driver CONFIG_MMC_SDHCI_PLTFM or an OpenFirmware driver
CONFIG_MMC_SDHCI_OF_ESDHC.
If I enable CONFIG_MMC_SDHCI_PLTFM I get a build error:
LD .tmp_vmlinux1
drivers/built-in.o:(.rodata+0xfa74): undefined reference to
`sdhci_tegra_dt_pdata'
make[2]: *** [.tmp_vmlinux1] Error 1
make[1]: *** [sub-make] Error 2
Which when I poke around seems to be caused by the fact that the platform case
really only works for tegra at the moment. Here is a snippet from
drivers/mmc/host/sdhci-pltfm.c:
#if defined(CONFIG_OF)
#include <linux/of_device.h>
static const struct of_device_id sdhci_dt_ids[] = {
{ .compatible = "nvidia,tegra20-sdhci", .data = &sdhci_tegra_dt_pdata },
{ }
};
MODULE_DEVICE_TABLE(platform, sdhci_dt_ids);
static const struct of_device_id *sdhci_get_of_device_id(struct platform_device
*pdev)
{
return of_match_device(sdhci_dt_ids, &pdev->dev);
}
#else
#define sdhci_dt_ids NULL
static inline struct of_device_id *sdhci_get_of_device_id(struct
platform_device *pdev)
{
return NULL;
}
#endif
For the OpenFirmware case case to work the device needs a node in the
device tree. However the device tree for imx51 is pretty much empty:
/*
* Copyright 2011 Linaro Ltd.
*
* The code contained herein is licensed under the GNU General Public
* License. You may obtain a copy of the GNU General Public License
* Version 2 or later at the following locations:
*
* http://www.opensource.org/licenses/gpl-license.html
* http://www.gnu.org/copyleft/gpl.html
*/
/dts-v1/;
/include/ "skeleton.dtsi"
/ {
model = "Freescale i.MX51 Babbage";
compatible = "fsl,mx51-babbage", "fsl,mx51";
memory {
reg = <0x90000000 0x20000000>;
};
};
** Also affects: linaro-landing-team-freescale
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/839541
Title:
mx51evk can't find rootfs by UUID, LABEL or device node, then drop to
initramfs
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