Re: [PATCH] Documentation: ARM: EXYNOS: Update bootloader interface on Exynos542x
On 10/23/15 13:19, Krzysztof Kozlowski wrote: > Update the documentation about: > 1. Usage of PMU_SPARE2 register. >Bootloaders on Exynos542x-based boards often use the register >PMU_SPARE2 (0x908) in the same way as on Exynos3250: as a indicator >the secondary CPU was booted on. The bootloader will set this value >to non-zero, after sucessfull power up of secondary CPU. In the same >time this booted CPU will stuck (spin) waiting for software reset. > 2. Exynos542x entry address for secondary CPU boot up after system >suspend (with MCPM enabled and in non-secure mode). > > See arch/arm/mach-exynos/mcpm-exynos.c for source code. > > Signed-off-by: Krzysztof Kozlowski > --- > Documentation/arm/Samsung/Bootloader-interface.txt | 5 +++-- > 1 file changed, 3 insertions(+), 2 deletions(-) > > diff --git a/Documentation/arm/Samsung/Bootloader-interface.txt > b/Documentation/arm/Samsung/Bootloader-interface.txt > index df8d4fb85939..ed494ac0beb2 100644 > --- a/Documentation/arm/Samsung/Bootloader-interface.txt > +++ b/Documentation/arm/Samsung/Bootloader-interface.txt > @@ -19,7 +19,7 @@ executing kernel. > Address: sysram_ns_base_addr > OffsetValuePurpose > = > -0x08 exynos_cpu_resume_ns System suspend > +0x08 exynos_cpu_resume_ns, mcpm_entry_point System suspend > 0x0c 0x0bad (Magic cookie)System suspend > 0x1c exynos4_secondary_startupSecondary CPU boot > 0x1c + 4*cpu exynos4_secondary_startup (Exynos4412) Secondary CPU boot > @@ -56,7 +56,8 @@ OffsetValue > Purpose > Address: pmu_base_addr > OffsetValue Purpose > = > -0x0908Non-zero (only Exynos3250) Secondary CPU boot up indicator > +0x0908Non-zeroSecondary CPU boot up indicator > + on Exynos3250 and Exynos542x > > > 4. Glossary Applied, thanks. - Kukjin -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
[PATCH] Documentation: ARM: EXYNOS: Update bootloader interface on Exynos542x
Update the documentation about: 1. Usage of PMU_SPARE2 register. Bootloaders on Exynos542x-based boards often use the register PMU_SPARE2 (0x908) in the same way as on Exynos3250: as a indicator the secondary CPU was booted on. The bootloader will set this value to non-zero, after sucessfull power up of secondary CPU. In the same time this booted CPU will stuck (spin) waiting for software reset. 2. Exynos542x entry address for secondary CPU boot up after system suspend (with MCPM enabled and in non-secure mode). See arch/arm/mach-exynos/mcpm-exynos.c for source code. Signed-off-by: Krzysztof Kozlowski --- Documentation/arm/Samsung/Bootloader-interface.txt | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/Documentation/arm/Samsung/Bootloader-interface.txt b/Documentation/arm/Samsung/Bootloader-interface.txt index df8d4fb85939..ed494ac0beb2 100644 --- a/Documentation/arm/Samsung/Bootloader-interface.txt +++ b/Documentation/arm/Samsung/Bootloader-interface.txt @@ -19,7 +19,7 @@ executing kernel. Address: sysram_ns_base_addr OffsetValuePurpose = -0x08 exynos_cpu_resume_ns System suspend +0x08 exynos_cpu_resume_ns, mcpm_entry_point System suspend 0x0c 0x0bad (Magic cookie)System suspend 0x1c exynos4_secondary_startupSecondary CPU boot 0x1c + 4*cpu exynos4_secondary_startup (Exynos4412) Secondary CPU boot @@ -56,7 +56,8 @@ OffsetValue Purpose Address: pmu_base_addr OffsetValue Purpose = -0x0908Non-zero (only Exynos3250) Secondary CPU boot up indicator +0x0908Non-zeroSecondary CPU boot up indicator + on Exynos3250 and Exynos542x 4. Glossary -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
