Hi Chao-Jui, You can write driver as part l4re and use block driver from l4linux. Or you can modify l4linux for direct access to hardware. We've done WiFi and USB-OTG support in l4linux for OMAP3 based board. But it was not easy. We've move a lot of platform specific code from arch/arm/mach-omap2 and arch/arm/plat-omap to l4 arch. Part of code required modification, for example, OMAP3 register mapping, restore startup sequence. We've chosen this way because USB-OTG and WiFi drivers are dificult for writing from scratch and this way allowed to keep our time. -- Ivan Loskutov 2013/4/5 Chao-Jui Chang <ppc52776@gmail.com>

Hi hackers,

I want to use SD card as root file system for L4Linux.

Base on my understand, we can use IO assignment in libio and let L4Linux kernel to access the devices directly. If this is correct, then next we need to choose correct driver in L4Linux's config menu.

However, some device is platform specific, for example, "SDHCI support on Samsung S3C SoC" requires PLAT_SAMSUNG. This option is not available in L4Linux config menu. I have tried to modify the dependence in kernel's Kconfig, but it results in lots of compiler error, such as missing header files.

Is this the correct way to achieve my goal? Or I need to make the driver as part of l4re ?

Thanks, Chao-Jui

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