230321-02 - experimental debian sid image for the starfive visionfive2 riscv64 sbc

• this is just an experimental testing image
• see: https://github.com/hexdump0815/imagebuilder/tree/main/systems/starfive_visionfive2
• based on debian sid/unstable riscv64 port
• the v5.15 kernel used is based on VF2_v2.10.4 of the starfive visionfive2 kernel tree and some patches from the icenowy star64 kernel tree
• framebuffer console added (part of the patches mentioned above)
• a v5.15 backport of mglru added (multigen lru mm patches, which were merged into v6.1 mainline and improve performance especially in low memory situations)
• has some features typical for the images here: btrfs rootfs with zstd compression, zswap with zstd compression, mgrlu enabled by default
• please switch the dip switches on the board to "sd", i.e. upper one (marked rgpio_1) to 0 (marked ON on the dip switch, i.e. default setting) and lower one (marked rgpio_0) to 1 (marked 2 on the dip switch, i.e. oposite to the default setting) to boot directly from the sd card as this image has sbi/u-boot included in its boot blocks (taken from the 202302 starfive debian image)
• small erratum: a leftover /debootstrap directory which can be deleted
• username/password is as usual linux/changeme
• in case an image should not properly boot on your system, then please add a comment here: #130
• in case everything is working well, feel free to leave a comment here: #141