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dmarc=pass (p=quarantine dis=none) header.from=wdc.com X-Mailman-Original-Authentication-Results: smtp3.osuosl.org; dkim=pass (2048-bit key, unprotected) header.d=wdc.com header.i=@wdc.com header.a=rsa-sha256 header.s=dkim.wdc.com header.b=FCMGx+9Y; dkim=pass (1024-bit key, unprotected) header.d=sharedspace.onmicrosoft.com header.i=@sharedspace.onmicrosoft.com header.a=rsa-sha256 header.s=selector2-sharedspace-onmicrosoft-com header.b=TgJ/APJh X-Mailman-Original-Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=wdc.com; Subject: Re: [Buildroot] [PATCH 1/4] board/radxa/rock5b: use PARTLABEL to specify rootfs X-BeenThere: buildroot@buildroot.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussion and development of buildroot List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: Niklas Cassel via buildroot Reply-To: Niklas Cassel Cc: Niklas Cassel , Damien Le Moal , Kilian Zinnecker , Niklas Cassel via buildroot Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: buildroot-bounces@buildroot.org Sender: "buildroot" Hello Thomas, On Fri, Aug 30, 2024 at 06:56:13PM +0200, Thomas Petazzoni wrote: > On Fri, 30 Aug 2024 12:13:24 +0200 > Niklas Cassel via buildroot wrote: > > > diff --git a/board/radxa/rock5b/extlinux.conf b/board/radxa/rock5b/extlinux.conf > > index a1a531f038..8759d7491c 100644 > > --- a/board/radxa/rock5b/extlinux.conf > > +++ b/board/radxa/rock5b/extlinux.conf > > @@ -1,4 +1,4 @@ > > label Radxa Rock 5b Linux > > kernel /boot/Image > > devicetree /boot/rk3588-rock-5b.dtb > > - append root=/dev/mmcblk1p1 rw rootfstype=ext4 earlycon rootwait > > + append root=PARTLABEL=rootfs rw rootfstype=ext4 earlycon rootwait > > I'm wondering how this can work. Indeed the genimage.cfg file for this > board creates a MBR partition table, which doesn't have any > concept/space to store partition labels (unlike GPT partition tables). > And my understanding is that PARTLABEL is based on GPT partition > labels. So how can this work? Because the genimage partition-table-type is set to 'hybrid', not 'mbr': $ git grep partition-table-type board/radxa/rock5b/genimage.cfg board/radxa/rock5b/genimage.cfg: partition-table-type = "hybrid" From: https://github.com/pengutronix/genimage "hybrid: A hybrid MBR/GPT partition table. Partitions with an explicit partition-type will be placed in in the MBR table. At most 3 such partitions are allowed. This limit does not effect the maximum number of GPT partition entries in the same image." The prints from genimage at build time: INFO: hdimage(sdcard.img): adding primary partition 'uboot' from 'u-boot-rockchip.bin' ... INFO: hdimage(sdcard.img): adding primary partition 'rootfs' (in MBR) from 'rootfs.ext2' ... INFO: hdimage(sdcard.img): adding primary partition '[MBR]' ... INFO: hdimage(sdcard.img): adding primary partition '[GPT header]' ... INFO: hdimage(sdcard.img): adding primary partition '[GPT array]' ... INFO: hdimage(sdcard.img): adding primary partition '[GPT backup]' ... INFO: hdimage(sdcard.img): writing GPT INFO: hdimage(sdcard.img): writing hybrid MBR Doing a: $ echo print | parted output/images/sdcard.img Model: (file) Disk /home/nks/src/buildroot-rock5b/output/images/sdcard.img: 272MB Sector size (logical/physical): 512B/512B Partition Table: gpt Disk Flags: Number Start End Size File system Name Flags 1 9633kB 272MB 262MB ext4 rootfs Shows a gpt partition with label 'rootfs'. During boot: [ 3.134613] Waiting for root device PARTLABEL=rootfs... [ 3.422771] dwmmc_rockchip fe2c0000.mmc: Successfully tuned phase to 247 [ 3.423813] mmc1: new ultra high speed SDR104 SDXC card at address aaaa [ 3.424819] mmcblk1: mmc1:aaaa SH64G 59.5 GiB [ 3.429940] mmcblk1: p1 [ 3.461922] EXT4-fs (mmcblk1p1): orphan cleanup on readonly fs [ 3.462582] EXT4-fs (mmcblk1p1): mounted filesystem 5d48042f-ad69-4b24-ad35-61abae2598b2 ro with ordered data mode. Quota mode: none. [ 3.463676] VFS: Mounted root (ext4 filesystem) readonly on device 179:1. [ 3.464599] devtmpfs: mounted [ 3.466399] Freeing unused kernel memory: 10304K [ 3.466843] Run /sbin/init as init process [ 3.554357] EXT4-fs (mmcblk1p1): re-mounted 5d48042f-ad69-4b24-ad35-61abae2598b2 r/w. Quota mode: none. > > From the Linux kernel code: > > * 9) PARTLABEL= with name being the GPT partition label. > * MSDOS partitions do not support labels! > > Note that I would be fine with switching to a GPT partition table to > make this work. That is not strictly necessary, since hybrid means: GPT (all partitions) + MBR (includes only partitions with a partition-type set) However, looking at the buildroot tree: $ git grep partition-table-type | grep gpt | wc -l 29 $ git grep partition-table-type | grep hybrid | wc -l 2 $ git grep partition-table-type | grep mbr | wc -l 0 It seems that only two boards using hybrid are: board/avnet/rzboard_v2l/genimage.cfg: partition-table-type = "hybrid" board/radxa/rock5b/genimage.cfg: partition-table-type = "hybrid" I don't know of any reason to keep the mbr for rock5b, so I'm quite sure that we could change rock5b from hybrid to gpt. I'm not familiar with rzboard_v2l. Most likely there also isn't any good reason to keep the mbr. I don't have that board, so I wouldn't be able to test. Kind regards, Niklas _______________________________________________ buildroot mailing list buildroot@buildroot.org https://lists.buildroot.org/mailman/listinfo/buildroot