Hi Anson, On Tue, Oct 29, 2019 at 7:06 AM Anson Huang <Anson.Huang@xxxxxxx> wrote: > > i.MX7ULP does NOT support runtime switching clock source for PCC, > APLL_PFD1 by default is usdhc's clock source, so just use it > in kernel to avoid below kernel dump during kernel boot up and > make sure kernel can boot up with SD root file-system. > > [ 3.035892] Loading compiled-in X.509 certificates > [ 3.136301] sdhci-esdhc-imx 40370000.mmc: Got CD GPIO > [ 3.242886] mmc0: Reset 0x1 never completed. > [ 3.247190] mmc0: sdhci: ============ SDHCI REGISTER DUMP =========== > [ 3.253751] mmc0: sdhci: Sys addr: 0x00000000 | Version: 0x00000002 > [ 3.260218] mmc0: sdhci: Blk size: 0x00000200 | Blk cnt: 0x00000001 > [ 3.266775] mmc0: sdhci: Argument: 0x00009a64 | Trn mode: 0x00000000 > [ 3.273333] mmc0: sdhci: Present: 0x00088088 | Host ctl: 0x00000002 > [ 3.279794] mmc0: sdhci: Power: 0x00000000 | Blk gap: 0x00000080 > [ 3.286350] mmc0: sdhci: Wake-up: 0x00000008 | Clock: 0x0000007f > [ 3.292901] mmc0: sdhci: Timeout: 0x0000008c | Int stat: 0x00000000 > [ 3.299364] mmc0: sdhci: Int enab: 0x007f010b | Sig enab: 0x00000000 > [ 3.305918] mmc0: sdhci: ACmd stat: 0x00000000 | Slot int: 0x00008402 > [ 3.312471] mmc0: sdhci: Caps: 0x07eb0000 | Caps_1: 0x0000b400 > [ 3.318934] mmc0: sdhci: Cmd: 0x0000113a | Max curr: 0x00ffffff > [ 3.325488] mmc0: sdhci: Resp[0]: 0x00000900 | Resp[1]: 0x0039b37f > [ 3.332040] mmc0: sdhci: Resp[2]: 0x325b5900 | Resp[3]: 0x00400e00 > [ 3.338501] mmc0: sdhci: Host ctl2: 0x00000000 > [ 3.343051] mmc0: sdhci: ============================================ > > Signed-off-by: Anson Huang <Anson.Huang@xxxxxxx> Thanks, with this patch applied I can get SD card rootfs to get mounted: Tested-by: Fabio Estevam <festevam@xxxxxxxxx> I think this fix deserves a Fixes tag so that it can be backported to older kernels.
