]> git.sur5r.net Git - u-boot/commit
arm: mxs: Enable booting of mx28 without battery
authorGraeme Russ <gruss@tss-engineering.com>
Sun, 25 Jan 2015 01:07:52 +0000 (12:07 +1100)
committerStefano Babic <sbabic@denx.de>
Tue, 10 Feb 2015 11:48:50 +0000 (12:48 +0100)
commit7a086037071401ee781425c382846dddfe80df68
treeaf1c3a2f0c7c3e631e6b49fdc5f19d387a496b30
parent950eaf6230496585e72ebb965c458d35c6c7eac1
arm: mxs: Enable booting of mx28 without battery

Section 4.1.2 of Freescale Application Note AN4199 describes the
configuration required to operate the mx28 from a 5V source without a
battery.

This patch changes the behaviour of the dropout control of the DC-DC
converter (refer to section 11.12.9 of the mx28 Application Processor
Reference Manual - Document Number: MCIMX28RM, Rev 2, 08/2013) to the
following:
 - Always use 4P2 Linear Regulator if CONFIG_SYS_MXS_VDD5V_ONLY is defined
 - Switch between 4P2 Linear Regulator and Battery, using whichever has
   the highest voltage if CONFIG_SYS_MXS_VDD5V_ONLY isnot set (this is
   the same as the pre-patch behaviour)

Signed-off-by: Graeme Russ <gruss@tss-engineering.com>
Signed-off-by: Damien Gotfroi <dgotfroi@greenwatch.be>
arch/arm/cpu/arm926ejs/mxs/spl_power_init.c