u-boot/arch
Akshay Saraswat ac0d98cd55 Exynos542x: CPU: Power down all secondary cores
This patch adds code to shutdown secondary cores.
When U-boot comes up, all secondary cores appear powered on,
which is undesirable and causes side effects while
initializing these cores in kernel.

Secondary core power down happens in following steps:

Step-1: After Exynos power-on, primary core starts executing first.
Step-2: In iROM code every core has to check 2 flags i.e.
	addresses 0x02020028 & 0x02020004.
Step-3: Initially 0x02020028 is 0 for all cores and 0x02020004 has a
	jump address for primary core and 0 for all secondary cores.
Step-4: Therefore, primary core follows normal iROM execution and jumps
	to BL1 eventually, whereas all secondary cores enter WFE.
Step-5: When primary core comes into function secondary_cores_configure,
	it puts pointer to function power_down_core into 0x02020004
	and provides DSB and SEV for all cores so that they may come out
	of WFE and jump to power_down_core function.
Step-6: And ultimately because of power_down_core all
	secondary cores shut-down.

Signed-off-by: Kimoon Kim <kimoon.kim@samsung.com>
Signed-off-by: Akshay Saraswat <akshay.s@samsung.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
2015-02-28 18:03:46 +09:00
..
arc arc: introduce U-Boot port for ARCv2 ISA 2015-02-13 09:17:51 +03:00
arm Exynos542x: CPU: Power down all secondary cores 2015-02-28 18:03:46 +09:00
avr32 avr32: add generic board support 2015-02-17 22:54:38 +01:00
blackfin Export redesign 2015-01-29 17:09:57 -07:00
m68k m68k: remove TASREG board 2015-01-13 09:37:21 -05:00
microblaze microblaze: spl: Add LISTS to linker script 2015-02-09 15:13:12 +01:00
mips MIPS: unify CPU code in arch/mips/cpu/ 2015-01-30 14:19:58 +01:00
nds32 common: Move dram_init() declaration to common location 2015-02-09 15:08:48 +01:00
nios2 Kbuild: introduce Makefile in arch/$ARCH/ 2014-12-08 09:35:45 -05:00
openrisc Kbuild: introduce Makefile in arch/$ARCH/ 2014-12-08 09:35:45 -05:00
powerpc common/board_f: factor out reserve_stacks 2015-02-17 22:52:42 +01:00
sandbox Merge branch 'sandbox' of git://git.denx.de/u-boot-x86 2015-02-16 08:37:22 -05:00
sh Replace <compiler.h> with <linux/compiler.h> 2014-12-08 09:35:46 -05:00
sparc Kbuild: introduce Makefile in arch/$ARCH/ 2014-12-08 09:35:45 -05:00
x86 dm: Kconfig: Move CONFIG_SYS_MALLOC_F_LEN to Kconfig 2015-02-12 15:17:28 -07:00
.gitignore .gitignore: drop include/asm/proc from ignore pattern 2014-06-19 11:18:54 -04:00
Kconfig powerpc: Permit device tree control of U-Boot (CONFIG_OF_CONTROL) 2015-02-12 10:35:30 -07:00