fs/romfs: add U-Boot image support
PATCH 1/1 fs/romfs: add U-Boot image support
Adds U-Boot image support for romfs root filesystems. This allows you to use the bootm command in U-Boot to load the rootfs.
--- fs/romfs/Config.in | 13 +++++++++++++ fs/romfs/romfs.mk | 10 +++++++++- 2 files changed, 22 insertions(+), 1 deletion(-)
fs/romfs/Config.in +13 -0
@@ -2,3 +2,16 @@ config BR2_TARGET_ROOTFS_ROMFS bool "romfs root filesystem" help Build a romfs image of the root filesystem. + +if BR2_TARGET_ROOTFS_ROMFS + +config BR2_TARGET_ROOTFS_ROMFS_UIMAGE + bool "u-boot image of romfs root filesystem" + select BR2_PACKAGE_HOST_UBOOT_TOOLS + help + Add a u-boot header to the romfs root filesystem. This allows + the u-boot image to be loaded with the bootm command in U-Boot. + + The u-boot image will be called rootfs.romfs.uboot + +endif
fs/romfs/romfs.mk +9 -1
@@ -12,4 +12,12 @@ define ROOTFS_ROMFS_CMD $(HOST_DIR)/usr/bin/genromfs -d $(TARGET_DIR) -f $@ endef -$(eval $(call ROOTFS_TARGET,romfs)) +$(BINARIES_DIR)/rootfs.romfs.uboot: $(BINARIES_DIR)/rootfs.romfs host-uboot-tools + $(MKIMAGE) -A $(MKIMAGE_ARCH) -T ramdisk -O linux \ + -C none -d $<$(ROOTFS_ROMFS_COMPRESS_EXT) $@ + +ifeq ($(BR2_TARGET_ROOTFS_ROMFS_UIMAGE),y) +ROOTFS_ROMFS_POST_TARGETS += $(BINARIES_DIR)/rootfs.romfs.uboot +endif + +$(eval $(call ROOTFS_TARGET,romfs))
Signature · 1 line
2.3.5
PATCH 1/1 fs/romfs: add U-Boot image support
Quoted 2 lines · Hoang Tran
Adds U-Boot image support for romfs root filesystems. This allows you to use the bootm command in U-Boot to load the rootfs.
Why would you want to do that? I don't see any reason to use the old
block-device-initrd rather than the usual cpio-initramfs...
Regards,
Arnout
Quoted 2 lines
Signed-off-by Hoang Tran <[email protected]>
[snip]
Signature · 6 lines
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
PATCH 1/1 fs/romfs: add U-Boot image support
In reply to Hoang TranDear Hoang Tran,
Quoted 8 lines · Hoang Tran
Adds U-Boot image support for romfs root filesystems. This allows you to use the bootm command in U-Boot to load the rootfs.
Signed-off-by Hoang Tran <[email protected]>--- fs/romfs/Config.in | 13 +++++++++++++ fs/romfs/romfs.mk | 10 +++++++++- 2 files changed, 22 insertions(+), 1 deletion(-)
Considering the absence of reaction to Arnout's comment about your patch, I've marked it as 'Rejected' in our patch tracking system. Of course, if you believe the patch is still useful despite Arnout comment, do not hesitate to resend an updated version with an extended justification.
Thanks,
Thomas
Signature · 3 lines
Thomas Petazzoni, CTO, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com
PATCH 1/1 fs/romfs: add U-Boot image support
Quoted 9 lines
Quoted 8 lines
Adds U-Boot image support for romfs root filesystems. This allows you to use the bootm command in U-Boot to load the rootfs.
Signed-off-by Hoang Tran <[email protected]>--- fs/romfs/Config.in | 13 +++++++++++++ fs/romfs/romfs.mk | 10 +++++++++- 2 files changed, 22 insertions(+), 1 deletion(-)
Quoted 5 lines
Considering the absence of reaction to Arnout's comment about your patch, I've marked it as 'Rejected' in our patch tracking system. Of course, if you believe the patch is still useful despite Arnout comment, do not hesitate to resend an updated version with an extended justification.
Dear Thomas, Arnout,
Sorry I did not response because of the problem of my email client. But anyway I agree with Arnout.
My rootfs is in romfs and I intended to make a uRamdisk for quick testing. But we could use cpio Ramdisk instead.
Regards,
Hoang
PATCH 1/1 fs/romfs: add U-Boot image support
Dear Hoang Tran,
Quoted 4 lines · Hoang Tran
Sorry I did not response because of the problem of my email client. But anyway I agree with Arnout.
My rootfs is in romfs and I intended to make a uRamdisk for quick testing. But we could use cpio Ramdisk instead.
a "uRamdisk" can be in cpio format. Basically the "u" is just a container for a ramdisk, and the ramdisk itself can use the cpio format, or ext2, or whatever filesystem you want. However, by using cpio, you leverage the initramfs mechanism of the kernel, which is much better than initrd in terms of memory consumption.
See:
https://www.kernel.org/doc/Documentation/filesystems/ramfs-rootfs-initramfs.txt
Best regards,
Thomas
Signature · 3 lines
Thomas Petazzoni, CTO, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com
PATCH 1/1 fs/romfs: add U-Boot image support
Quoted 15 lines · Thomas Petazzoni
Dear Hoang Tran,
Quoted 4 lines · Hoang Tran
Sorry I did not response because of the problem of my email client. But anyway I agree with Arnout.
My rootfs is in romfs and I intended to make a uRamdisk for quick testing. But we could use cpio Ramdisk instead.a "uRamdisk" can be in cpio format. Basically the "u" is just a container for a ramdisk, and the ramdisk itself can use the cpio format, or ext2, or whatever filesystem you want. However, by using cpio, you leverage the initramfs mechanism of the kernel, which is much better than initrd in terms of memory consumption.
I get it. That is really useful. Thank you.
Hoang