diff options
Diffstat (limited to 'Documentation/arm')
| -rw-r--r-- | Documentation/arm/SPEAr/overview.txt | 2 | ||||
| -rw-r--r-- | Documentation/arm/Samsung/Bootloader-interface.txt | 15 | ||||
| -rw-r--r-- | Documentation/arm/keystone/Overview.txt | 73 |
3 files changed, 88 insertions, 2 deletions
diff --git a/Documentation/arm/SPEAr/overview.txt b/Documentation/arm/SPEAr/overview.txt index 65610bf52ebf..1b049be6c84f 100644 --- a/Documentation/arm/SPEAr/overview.txt +++ b/Documentation/arm/SPEAr/overview.txt @@ -60,4 +60,4 @@ Introduction Document Author --------------- - Viresh Kumar <viresh.linux@gmail.com>, (c) 2010-2012 ST Microelectronics + Viresh Kumar <vireshk@kernel.org>, (c) 2010-2012 ST Microelectronics 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 diff --git a/Documentation/arm/keystone/Overview.txt b/Documentation/arm/keystone/Overview.txt new file mode 100644 index 000000000000..f17bc4c9dff9 --- /dev/null +++ b/Documentation/arm/keystone/Overview.txt @@ -0,0 +1,73 @@ + TI Keystone Linux Overview + -------------------------- + +Introduction +------------ +Keystone range of SoCs are based on ARM Cortex-A15 MPCore Processors +and c66x DSP cores. This document describes essential information required +for users to run Linux on Keystone based EVMs from Texas Instruments. + +Following SoCs & EVMs are currently supported:- + +------------ K2HK SoC and EVM -------------------------------------------------- + +a.k.a Keystone 2 Hawking/Kepler SoC +TCI6636K2H & TCI6636K2K: See documentation at + http://www.ti.com/product/tci6638k2k + http://www.ti.com/product/tci6638k2h + +EVM: +http://www.advantech.com/Support/TI-EVM/EVMK2HX_sd.aspx + +------------ K2E SoC and EVM --------------------------------------------------- + +a.k.a Keystone 2 Edison SoC +K2E - 66AK2E05: See documentation at + http://www.ti.com/product/66AK2E05/technicaldocuments + +EVM: +https://www.einfochips.com/index.php/partnerships/texas-instruments/k2e-evm.html + +------------ K2L SoC and EVM --------------------------------------------------- + +a.k.a Keystone 2 Lamarr SoC +K2L - TCI6630K2L: See documentation at + http://www.ti.com/product/TCI6630K2L/technicaldocuments +EVM: +https://www.einfochips.com/index.php/partnerships/texas-instruments/k2l-evm.html + +Configuration +------------- + +All of the K2 SoCs/EVMs share a common defconfig, keystone_defconfig and same +image is used to boot on individual EVMs. The platform configuration is +specified through DTS. Following are the DTS used:- + K2HK EVM : k2hk-evm.dts + K2E EVM : k2e-evm.dts + K2L EVM : k2l-evm.dts + +The device tree documentation for the keystone machines are located at + Documentation/devicetree/bindings/arm/keystone/keystone.txt + +Known issues & workaround +------------------------- + +Some of the device drivers used on keystone are re-used from that from +DaVinci and other TI SoCs. These device drivers may use clock APIs directly. +Some of the keystone specific drivers such as netcp uses run time power +management API instead to enable clock. As this API has limitations on +keystone, following workaround is needed to boot Linux. + + Add 'clk_ignore_unused' to the bootargs env variable in u-boot. Otherwise + clock frameworks will try to disable clocks that are unused and disable + the hardware. This is because netcp related power domain and clock + domains are enabled in u-boot as run time power management API currently + doesn't enable clocks for netcp due to a limitation. This workaround is + expected to be removed in the future when proper API support becomes + available. Until then, this work around is needed. + + +Document Author +--------------- +Murali Karicheri <m-karicheri2@ti.com> +Copyright 2015 Texas Instruments |
