2015-07-05 08:38:05

by Krzysztof Kozłowski

Subject: [PATCH] Documentation: ARM: EXYNOS: Extend boot loader interface documentation

Extend the kernel-bootloader interface documentation with usage of
register INFORM1 (0x0804) and different CPU resume address on Exynos542x
family (with Multi-Cluster Power Management enabled).

Additionally add glossary and reformat section titles.

Signed-off-by: Krzysztof Kozlowski <[email protected]>
---
Documentation/arm/Samsung/Bootloader-interface.txt | 15 ++++++++++++++-
1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/Documentation/arm/Samsung/Bootloader-interface.txt b/Documentation/arm/Samsung/Bootloader-interface.txt
index b96ead9a6919..df8d4fb85939 100644
--- a/Documentation/arm/Samsung/Bootloader-interface.txt
+++ b/Documentation/arm/Samsung/Bootloader-interface.txt
@@ -15,6 +15,7 @@ executing kernel.


1. Non-Secure mode
+
Address: sysram_ns_base_addr
Offset Value Purpose
=============================================================================
@@ -28,6 +29,7 @@ Offset Value Purpose


2. Secure mode
+
Address: sysram_base_addr
Offset Value Purpose
=============================================================================
@@ -40,14 +42,25 @@ Offset Value Purpose
Address: pmu_base_addr
Offset Value Purpose
=============================================================================
-0x0800 exynos_cpu_resume AFTR
+0x0800 exynos_cpu_resume AFTR, suspend
+0x0800 mcpm_entry_point (Exynos542x with MCPM) AFTR, suspend
+0x0804 0xfcba0d10 (Magic cookie) AFTR
+0x0804 0x00000bad (Magic cookie) System suspend
0x0814 exynos4_secondary_startup (Exynos4210 r1.1) Secondary CPU boot
0x0818 0xfcba0d10 (Magic cookie, Exynos4210 r1.1) AFTR
0x081C exynos_cpu_resume (Exynos4210 r1.1) AFTR


3. Other (regardless of secure/non-secure mode)
+
Address: pmu_base_addr
Offset Value Purpose
=============================================================================
0x0908 Non-zero (only Exynos3250) Secondary CPU boot up indicator
+
+
+4. Glossary
+
+AFTR - ARM Off Top Running, a low power mode, Cortex cores and many other
+modules are power gated, except the TOP modules
+MCPM - Multi-Cluster Power Management
--
2.1.4

2015-07-10 20:00:11

by Jonathan Corbet

Subject: Re: [PATCH] Documentation: ARM: EXYNOS: Extend boot loader interface documentation

On Sun, 5 Jul 2015 11:56:51 +0900
Krzysztof Kozlowski <[email protected]> wrote:

> Extend the kernel-bootloader interface documentation with usage of
> register INFORM1 (0x0804) and different CPU resume address on Exynos542x
> family (with Multi-Cluster Power Management enabled).

I have to assume that the new info here is correct...hopefully somebody
will scream if that's not true. Applied to the docs tree, thanks.

jon