On Thu 2024-02-22 @ 12:04:14 PM, Trevor Woerner via lists.yoctoproject.org wrote: > In order to boot successfully, most Rockchip SoCs require a specific > partitioning scheme which was defined many years (and many SoCs) ago. That > partitioning scheme places the SPL and U-Boot at specific offsets at the > start of the boot block device: > > https://opensource.rock-chips.com/wiki_Partitions > > The Rockchip partitioning scheme goes on to also define the locations > of a number of additional partitions, including the "boot" and "root" > partitions. > > Since both the SPL and U-Boot have already been placed on the block device, > the "boot" partition only contains the extlinux config file and the > kernel+dtb/fitImage; it doesn't contain any bootloader artifacts (other > than the extlinux config). > > The location of the SPL partition is a hard dependency since the BOOTROM > etched inside the Rockchip SoCs is programmed to load and run a validated > binary it finds at this location. The locations of the "boot" and "root" > partitions are not so rigid since it is U-Boot which interacts with them. > U-Boot is very flexible with how it finds boot components, and in its > support for various devices, filesystems, sizes, etc. > > Both oe-core's U-Boot metadata and wic's bootimg-partition script contain > logic to generate the extlinux pieces required for a bootloader to boot > a Linux system. If both are enabled, the wic pieces silently clobber the > U-Boot pieces. However, the mechanisms contained in the U-Boot metadata are > much more flexible, from a user's point of view, than the mechanisms in > wic's bootimg-partition. > > If a user wishes to setup some sort of A/B redundant update mechanism, they > must have redundant root partitions (in order to update their filesystem > contents) but they also need to have redundant boot partitions if they > wish to update the kernel as part of their update mechanism. Pairing > redundant kernel partitions with redundant filesystem partitions becomes > unnecessarily complicated. Therefore it makes sense to combine the kernel > and the filesystem into the same partition so that both the kernel and > filesystem are updated, or rolled back, in lock-step as one unit. Specific > kernel versions and configurations often have dependencies on user-space > components and versions. > > The /boot location is not going away. This patch simply transfers > responsibility for its creation to the more flexible U-Boot mechanism > and includes the kernel as part of the same partition as the root > filesystem. Not only does it add flexibility, it also makes update schemes > more straightforward. Although having a separate /boot partition is a > "requirement" of the Rockchip partitioning scheme, it is not an actual > hard requirement when using a flexible, open-source bootloader (such as > U-Boot) instead of using Rockchip's proprietary miniloader, preloader, and > trust.img. > > Build-tested for all boards. > Run-tested on: > nanopi-m4-2gb, nanopi-m4b, nanopi-r2s, nanopi-r4s, roc-rk3328-cc, > rock-3a, rock-5a, rock-5b, rock-pi-4b, rock-pi-e, rock-pi-s, > rock64 > > Reviewed-by: Quentin Schulz <quentin.sch...@theobroma-systems.com> > Signed-off-by: Trevor Woerner <twoer...@gmail.com> > --- > changes in v4: > - updated for latest rockchip.wks > - remove offset for /boot partition (let wic calculate this) > > changes in v3: > - add back the comment explaining the need for NONFITDT > - change the inclusion of the u-boot-extlinux package from RRECOMMENDS > to RDEPENDS > - clarify the commit message to remove the un-true statement that sizes > are hard requirements > - add back the "--ptable gpt" line to rockchip.wks > > changes in v2: > - add UBOOT_EXTLINUX_FDT and tweak UBOOT_EXTLINUX_FDTDIR to modify their > behaviour based on whether or not KERNEL_IMAGETYPE is fitImage > - remove extraneous WKS_FILE_DEPENDS > - remove "--ptable gpt" from wks > - move newly added "earlycon" to UBOOT_EXTLINUX_CONSOLE > - re-word the commit message to better explain the behaviour of the > Rockchip BootROM > --- > conf/machine/include/rockchip-defaults.inc | 2 ++ > conf/machine/include/rockchip-extlinux.inc | 24 ++++++++++++++++++++++ > conf/machine/include/rockchip-wic.inc | 20 ++---------------- > wic/rockchip.wks | 12 +++++------ > 4 files changed, 33 insertions(+), 25 deletions(-) > create mode 100644 conf/machine/include/rockchip-extlinux.inc
Applied to meta-rockchip, master branch.
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