diff options
| author | Ye.Li <B37916@freescale.com> | 2015-03-30 16:03:13 +0800 |
|---|---|---|
| committer | Peng Fan <Peng.Fan@freescale.com> | 2015-04-29 15:08:08 +0800 |
| commit | 620cf5f3d4cf37b065b5857a8ea91d61bf6c471d (patch) | |
| tree | a899c503d619f403c4e42c44ecf93ffb19b9498c /doc/README.usb | |
| parent | 30bd4f80cee58b5f17d9a6454f79b9a90f78a47b (diff) | |
| download | u-boot-imx-620cf5f3d4cf37b065b5857a8ea91d61bf6c471d.zip u-boot-imx-620cf5f3d4cf37b065b5857a8ea91d61bf6c471d.tar.gz u-boot-imx-620cf5f3d4cf37b065b5857a8ea91d61bf6c471d.tar.bz2 | |
MLK-10504 imx: mx6dqarm2: Fix CCM setting for lpddr2 400Mhz support
Current uboot supports for running LPDDR2 at 400MHz on MX6Q ARM2 board,
but there is a problem in switching pre_periph_clk_sel to pll2_pfd2.
We cannot directly change the parent of pre_periph_clk_sel as this mux
is not a glitchless mux. We need to follow the correct procedure and wait
for the busy bits to clear before switching.
Change to follow the procedure:
1. Set periph_clk2 to OSC.
2. Switch the periph_clk to periph_clk2, checking the CCM_CDHIPR for periph_clk
, ahb_podf and axi_podf busy bits.
3. Setting the pre_periph_clk to PLL2 PFD 396M.
4. Switch the periph_clk back to pre_periph_clk and checking CCM_CDHIPR busy bits.
Signed-off-by: Ye.Li <B37916@freescale.com>
(cherry picked from commit 7490062ff86e1132b95bf153091f28f7940c0cf9)
Diffstat (limited to 'doc/README.usb')
0 files changed, 0 insertions, 0 deletions