On 18/10/2017 at 18:13, Benoît Thébaudeau wrote: > Hi Fabio, > > On 18/10/2017 at 17:57, Fabio Estevam wrote: >> Currently when a high speed SD card is connected on MX25 or MX51 boards >> the following error happens: >> >> U-Boot 2017.11-rc2 (Oct 18 2017 - 13:49:26 -0200) >> >> CPU: Freescale i.MX51 rev3.0 at 800 MHz >> Reset cause: POR >> Board: MX51EVK >> DRAM: 512 MiB >> MMC: FSL_SDHC: 0, FSL_SDHC: 1 >> *** Warning - read failed, using default environment >> >> In: serial >> Out: serial >> Err: serial >> Net: FEC >> Hit any key to stop autoboot: 0 >> => saveenv >> Saving Environment to MMC... >> Writing to MMC(0)... failed >> >> Workaround this issue by not setting the mmc high speed mode flags even >> if the HOSTCAPBLT register reports that the SD card can operate at >> high speed. >> >> Tested on imx51evk and imx25pdk boards. >> >> Signed-off-by: Fabio Estevam <fabio.este...@nxp.com> >> --- >> Kernel is capable of running the SD card at 50MHz clock, but U-Boot fails. >> >> I haven't had a chance to debug this further, but sending it as RFC in case >> someone has some suggestions. > > [...] > > You could stress-test the SD read/write accesses from U-Boot. Does it occur > with > all HS cards? > > You can try to set the drive strength of all the eSDHC pads to high or max > (for > each pad or for the group of pads depending on the register layout for the > pads > used on the board). This worked on my board (custom i.MX25-based, not > imx25pdk).
And set SRE to fast too. Benoît _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de https://lists.denx.de/listinfo/u-boot
