On Fri, Sep 22, 2023 at 07:41:37PM +0800, Xi Ruoyao wrote: > On Thu, 2023-09-21 at 18:49 -0700, Drew Fustini wrote: > > This series adds support for the eMMC on the BeagleV Ahead and the > > Sipeed LicheePi 4A. This allows the kernel to boot with the rootfs on > > eMMC. > > > > I tested on top of v6.6-rc2 with this config [1]. I was able to boot > > both the Ahead [2] and LPi4a [3] from eMMC. The following prerequisites > > are required: > > > > [PATCH v2] riscv: dts: thead: set dma-noncoherent to soc bus [4] > > > > I pushed a branch [5] with this patch series and the above patch for > > those that find a git branch easier to test. > > > > Please note that only the MMC controller connected to the eMMC device > > is enabled in the device trees for these two boards. I did not yet > > attempt to configure and use the microSD card slot. My preference is to > > address that in a future patch series. > > > > References: > > [1] https://gist.github.com/pdp7/5fbdcf2a65eb1abdd3a29d519c19cdd2 > > [2] https://gist.github.com/pdp7/91a801a5f8d1070c53509eda9800ad78 > > [3] https://gist.github.com/pdp7/1445c3c991e88fd69c60165cef65726a > > [4] https://lore.kernel.org/linux-riscv/20230912072232.2455-1-jszhang@xxxxxxxxxx/ > > [5] https://github.com/pdp7/linux/tree/b4/th1520-mmc > > I've tested this branch and successfully booted a rootfs on Lichee Pi 4A > eMMC with rootdelay=10. > > Curiously is there some way to make it work without rootdelay? Thank you for testing. This is the kernel command line that I am using on both the lpi4 and the ahead: root=/dev/mmcblk0p3 ro rootfstype=ext4 rootwait console=ttyS0,115200 I seem to recall that before I used rootwait that there would be a VFS oops because mmcblk0p3 didn't exist yet. Have you tried rootwait instead of the 10 second delay? I imagine an enforced delay would be very annoying. With "rootwait", I don't notice any delay, it boots to the login prompt faster than I can read the text scrolling by during boot. (my rootfs is a simple buildroot). thanks, drew
