xref: /rk3399_ARM-atf/docs/plat/stm32mp1.rst (revision c948f77136c42a92d0bb660543a3600c36dcf7f1) 
1Trusted Firmware-A for STM32MP1
2===============================
3
4STM32MP1 is a microprocessor designed by STMicroelectronics
5based on a dual Arm Cortex-A7.
6It is an Armv7-A platform, using dedicated code from TF-A.
7
8
9Design
10------
11The STM32MP1 resets in the ROM code of the Cortex-A7.
12The primary boot core (core 0) executes the boot sequence while
13secondary boot core (core 1) is kept in a holding pen loop.
14The ROM code boot sequence loads the TF-A binary image from boot device
15to embedded SRAM.
16
17The TF-A image must be properly formatted with a STM32 header structure
18for ROM code is able to load this image.
19Tool stm32image can be used to prepend this header to the generated TF-A binary.
20
21At compilation step, BL2, BL32 and DTB file are linked together in a single
22binary. The stm32image tool is also generated and the header is added to TF-A
23binary. This binary file with header is named tf-a-stm32mp157c-ev1.stm32.
24It can then be copied in the first partition of the boot device.
25
26
27Memory mapping
28~~~~~~~~~~~~~~
29
30::
31
32    0x00000000 +-----------------+
33               |                 |   ROM
34    0x00020000 +-----------------+
35               |                 |
36               |       ...       |
37               |                 |
38    0x2FFC0000 +-----------------+ \
39               |                 | |
40               |       ...       | |
41               |                 | |
42    0x2FFD8000 +-----------------+ |
43               |    TF-A DTB     | | Embedded SRAM
44    0x2FFDC000 +-----------------+ |
45               |       BL2       | |
46    0x2FFEF000 +-----------------+ |
47               |       BL32      | |
48    0x30000000 +-----------------+ /
49               |                 |
50               |       ...       |
51               |                 |
52    0x40000000 +-----------------+
53               |                 |
54               |                 |   Devices
55               |                 |
56    0xC0000000 +-----------------+ \
57               |                 | |
58    0xC0100000 +-----------------+ |
59               |       BL33      | | Non-secure RAM (DDR)
60               |       ...       | |
61               |                 | |
62    0xFFFFFFFF +-----------------+ /
63
64
65Boot sequence
66~~~~~~~~~~~~~
67
68ROM code -> BL2 (compiled with BL2_AT_EL3) -> BL32 (SP_min) -> BL33 (U-Boot)
69
70
71Build Instructions
72------------------
73
74To build:
75
76.. code:: bash
77
78    make CROSS_COMPILE=arm-linux-gnueabihf- PLAT=stm32mp1 ARCH=aarch32 ARM_ARCH_MAJOR=7 AARCH32_SP=sp_min
79    cd <u-boot_directory>
80    make stm32mp15_basic_defconfig
81    make DEVICE_TREE=stm32mp157c_ev1 all
82    ./tools/mkimage -T stm32image -a 0xC0100000 -e 0xC0100000 -d u-boot.bin u-boot.stm32
83
84The following build options are supported:
85
86- ``ENABLE_STACK_PROTECTOR``: To enable the stack protection.
87
88
89Populate SD-card
90----------------
91
92The SD-card has to be formated with GPT.
93It should contain at least those partitions:
94
95- fsbl: to copy the tf-a-stm32mp157c-ev1.stm32 binary
96- ssbl: to copy the u-boot.stm32 binary
97
98Usually, two copies of fsbl are used (fsbl1 and fsbl2) instead of one partition fsbl.
99