From 3f2546b2ef55b661fd8dd69682b38992225e86f6 Mon Sep 17 00:00:00 2001 From: fishsoupisgood Date: Mon, 29 Apr 2019 01:17:54 +0100 Subject: Initial import of qemu-2.4.1 --- roms/u-boot/doc/README.omap-reset-time | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) create mode 100644 roms/u-boot/doc/README.omap-reset-time (limited to 'roms/u-boot/doc/README.omap-reset-time') diff --git a/roms/u-boot/doc/README.omap-reset-time b/roms/u-boot/doc/README.omap-reset-time new file mode 100644 index 00000000..0c974bac --- /dev/null +++ b/roms/u-boot/doc/README.omap-reset-time @@ -0,0 +1,20 @@ +README on how reset time on OMAPs should be calculated + +CONFIG_OMAP_PLATFORM_RESET_TIME_MAX_USEC: +Most OMAPs' provide a way to specify the time for +which the reset should be held low while the voltages +and Oscillator outputs stabilize. + +This time is mostly board and PMIC dependent. Hence the +boards are expected to specify a pre-computed time +using the above option, (the details on how to compute +the value are given below) without which a default time +as specified by CONFIG_DEFAULT_OMAP_RESET_TIME_MAX_USEC +is used. + +The value for CONFIG_OMAP_PLATFORM_RESET_TIME_MAX_USEC +can be computed using a summation of the below 3 parameters +-1- Time taken by the Osciallator to stop and restart +-2- PMIC OTP time +-3- Voltage ramp time, which can be derived using the +PMIC slew rate and value of voltage ramp needed. -- cgit v1.2.3