Hi Tony, On 02/05/19 7:50 PM, Tony Lindgren wrote: > * Faiz Abbas <faiz_abbas@xxxxxx> [190502 01:48]: >> If UHS speed modes are enabled, a compatible SD card switches down to >> 1.8V during enumeration. If after this a software reboot/crash takes >> place and on-chip ROM tries to enumerate the SD card, the difference in >> IO voltages (host @ 3.3V and card @ 1.8V) may end up damaging the card. >> >> The fix for this is to have support for power cycling the card in >> hardware (with a PORz/soft-reset line causing a power cycle of the >> card). Since am571x-, am572x- and am574x-idk don't have this >> capability, disable voltage switching for these boards. >> >> The major effect of this is that the maximum supported speed >> mode is now high speed(50 MHz) down from SDR104(200 MHz). > > This sounds a bit urgent, does it also need a stable tag or is > it safe to apply against any earlier kernels? > This should be good to apply on any previous releases. Thanks, Faiz
