[U-Boot-Users] Run Linux kernel from within a JFFS2 filesystem
Hi all,
this is my first post in this mailing list. I hope I don't start with a FAQ.
On my board I have installed U-Boot and I'm able to run Linux kernel and rootfs via Flash/Flash (ramdisk/image file) or TFTP/NFS.
Of course, either ramdisk and nfs aren't suitable for my end application (ramdisk losts many RAM space and NFS won't be available).
So I'd like to use a local root filesystem stored in the NOR Flash (a J30 Intel), starting from the small ramdisk I have and adding all software I need.
I could divide my Flash memory in three partitions: - U-Boot bootloader (with the two sectors for its configuration) - Linux kernel image - JFFS2 root filesystem
But I want to go futher and I want to save the linux kernel image file into the root JFFS2 filesystem. So I'll have only two main partitions: - U-Boot bootloader (...) - JFFS2 root filesystem (with linuk kernel image file saved inside)
Is U-Boot able to run a kernel image file that is saved into a JFFS2 filesystem stored in the Flash? I think this is what happens on a desktop computer (where the bootloader is Grub and the root filesystem is on a hard-disk and the kernel is a file saved into it).
I think it isn't so simple for U-Boot that is capable of running the application (linux kernel in my case) only at a specified memory address (it doesn't have any knowledge about JFFS2 filesystem, do it?).
Many thanks for your comments and my compliments for the good work!
Giuseppe
Ciao Pesà,
U-Boot can load an image from a jffs2 fs using the fsload command:
fsload DEST_ADDR imagename
Furthermore, you need to properly define the mtdpart and mtdids environment vars or define the opportune #define, like this:
#define MTDIDS_DEFAULT "nor0=phys_mapped_flash" #define MTDPARTS_DEFAULT "mtdparts=phys_mapped_flash:2M(jffs2),10M(root)ro,2M(u-boot)ro,2M(kernel)ro"
ciao,
luigi
Il giorno sab, 14/06/2008 alle 11.48 +0200, Giuseppe Modugno ha scritto:
Hi all,
this is my first post in this mailing list. I hope I don't start with a FAQ.
On my board I have installed U-Boot and I'm able to run Linux kernel and rootfs via Flash/Flash (ramdisk/image file) or TFTP/NFS.
Of course, either ramdisk and nfs aren't suitable for my end application (ramdisk losts many RAM space and NFS won't be available).
So I'd like to use a local root filesystem stored in the NOR Flash (a J30 Intel), starting from the small ramdisk I have and adding all software I need.
I could divide my Flash memory in three partitions:
- U-Boot bootloader (with the two sectors for its configuration)
- Linux kernel image
- JFFS2 root filesystem
But I want to go futher and I want to save the linux kernel image file into the root JFFS2 filesystem. So I'll have only two main partitions:
- U-Boot bootloader (...)
- JFFS2 root filesystem (with linuk kernel image file saved inside)
Is U-Boot able to run a kernel image file that is saved into a JFFS2 filesystem stored in the Flash? I think this is what happens on a desktop computer (where the bootloader is Grub and the root filesystem is on a hard-disk and the kernel is a file saved into it).
I think it isn't so simple for U-Boot that is capable of running the application (linux kernel in my case) only at a specified memory address (it doesn't have any knowledge about JFFS2 filesystem, do it?).
Many thanks for your comments and my compliments for the good work!
Giuseppe
Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://sourceforge.net/services/buy/index.php _______________________________________________ U-Boot-Users mailing list U-Boot-Users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/u-boot-users
Ing. Luigi Mantellini Industrie Dial Face S.p.A. Via Canzo, 4 20068 Peschiera Borromeo (MI) Tel.: +39 02 5167 2813 Fax: +39 02 5167 2459 E-mail: luigi.mantellini@idf-hit.com
participants (2)
-
Giuseppe Modugno -
Luigi 'Comio' Mantellini