Hi, Fabio > 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. Will add fix tag in V2, thanks. Anson
