u-boot/arch/arm/cpu
Peng Fan 35c4ce5e20 imx: mx7d: isolate resources to domain 0 for A7 core
In current design, if any peripheral was assigned to both A7 and M4,
it will receive ipg_stop or ipg_wait when any of the 2 platforms
enter low power mode. We will have a risk that, if A7 enter wait,
M4 enter stop, peripheral will have chance to get ipg_stop and ipg_wait
asserted same time. Also if M4 enters stop mode, A7 will have no
chance to access the peripheral.
There are 26 peripherals affected by this IC issue:
SIM2(sim2/emvsim2)
SIM1(sim1/emvsim1)
UART1/UART2/UART3/UART4/UART5/UART6/UART7
SAI1/SAI2/SAI3
WDOG1/WDOG2/WDOG3/WDOG4
GPT1/GPT2/GPT3/GPT4
PWM1/PWM2/PWM3/PWM4
ENET1/ENET2
Software Workaround:
The solution is to set the peripherals to Domain0 by A core, since A core
in Domain0. The peripherals which will be used by M4, will be set to Domain1
by M4.
For example, A core set WDOG4 to domain0, but when M4 boots up, M4 will
set WDOG4 to domain1, because M4 will use WDOG4.

So the peripherals are not shared by them. This way requires
the uboot implemented the RDC driver and set the 26 IPs above
to domain 0 only. M4 image will set the M4 to domain 1 and
set peripheral which it will use to domain 1.

This patch enables the CONFIG_IMX_RDC and CONFIG_IMX_BOOTAUX for
i.MX7D SABRESD board, and setup the 26 IP resources to domain 0.

Signed-off-by: Ye.Li <ye.li@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
2016-02-21 11:46:26 +01:00
..
arm11 ARM: cache: implement a default weak flush_cache() function 2015-08-12 20:47:48 -04:00
arm720t ARM: ARM720t: remove empty asm/arch/hardware.h 2015-04-23 08:52:27 -04:00
arm920t arch/arm/cpu/arm920t/ep93xx/led.c: Mark inline functions as static inline 2015-12-05 18:22:28 -05:00
arm926ejs arm: lpc32xx: switch SPL builds to driver model 2016-01-13 21:05:22 -05:00
arm946es ARM: integrator: abolish CONFIG_INTEGRATOR 2015-04-23 08:52:27 -04:00
arm1136 imx: mx31 use new formula for get_cpu_rev 2015-09-02 15:29:14 +02:00
arm1176 arm1136/arm1176: Merge cache handling code 2015-08-12 20:47:41 -04:00
armv7 imx: mx7d: isolate resources to domain 0 for A7 core 2016-02-21 11:46:26 +01:00
armv7m stm32: move stm32 specific code to mach-stm32 2016-01-20 10:19:41 -05:00
armv8 armv8: ls2080a: Implement workaround for core errata 829520, 833471 2016-02-01 13:58:22 -08:00
pxa arm: pxa: clean-up include file order 2015-08-24 20:30:37 +02:00
sa1100 ARM: move -march=* and -mtune= options to arch/arm/Makefile 2015-03-27 16:55:22 +01:00
Makefile Various Makefiles: Add SPDX-License-Identifier tags 2015-11-10 09:19:52 -05:00
u-boot-spl.lds dm: arm: Put driver model I2C drivers before legacy ones 2015-07-21 17:39:21 -06:00
u-boot.lds ARM: Disable "DISCARD" for secure section if CONFIG_ARMV7_SECURE_BASE isn't defined 2016-01-31 16:32:56 +01:00