Introducing
Your new presentation assistant.
Refine, enhance, and tailor your content, source relevant images, and edit visuals quicker than ever before.
Trending searches
A Day inside AM65x
111
A Day inside AM65x
Lokesh Vutla
AM57x Boot Flow
- Boot master is A15.
- Boot stages:
AM57x Story
ROM
- Detect the boot media
- Initialize the boot peripheral
- Load file MLO
- Jump to SPL
GP HEADER
ROM
u-boot-spl.bin
DTB 1....n
MLO
SPL
HEADER
u-boot.bin
SPL
DTB 1....n
- Detect revision
- Save boot media
- Read EEPROM
- Setup AVS class-0 voltages
- Setup IODELAY, mux
- Setup PLLs
- Initialize DDR
- Initialize boot peripherial
- Load u-boot.img
U-Boot.img
U-Boot
- Verify the ddr
- Calculate reloc offset
- Relocate to end of DDR
- Init most commonly used peripherals
- Load ENV
- Provide U-Boot prompt
- Load Kernel
- Jump to kernel
U-Boot
Linux
- Standard Linux boot
- ARM specific init
- omap hwmod init
- smp_init
- driver probe
- Filesystem
Linux
K3 challanges
- Boot is split across multiple domains
- DMSC has secure ROM
- MCU R5 has peripheral ROM
- Initial bootloader should run on MCU R5
- Auto applications should start running on MCU R5 asap
- CAN response...
- Bootloader should start other remote cores for various applications.
- In production boot flow, u-boot proper might not be preferred
- Boot flow should be common across all K3 family covering all markets.
K3 Challenges
Boot Sequence
x509 cert
FIT Header
ATF
R5 SPL
Image Formats
TEE
FIT Header
sci.bin
A53 SPL
DTB 1..N
tispl.bin
sysfw
tiboot3.bin
AM65x SoC
MPU CL0
MPU CL1
DMSC
ROM - 160K
A53_0
A53_1
WKUP peripherals
AArch64 Privilege model
M3
IMEM - 192K
L1D$ - 32KB
L1P$ - 32KB
DMEM - 80K
L2$ - 512KB
MSMC
OC-MSRAM 512KB
DDRSS
SRAM/CACHE
DRU
BOOT_ROM 192K
The Day
GPU
MCU_ARMSS
R5F1
R5F0
Dual
Lockstep
MAIN NAVSS
I$ - 16KB
GTC
D$ - 16KB
TCM - 64KB
CBASS
MCU NAVSS
UART
Other MAIN
peripherals
MMC SD
MCU Peripherals
ROM FLOW
MPU CL0
MPU CL1
DMSC
Notes:
ROM - 160K
A53_0
A53_1
A53_0
WKUP peripherals
- ROM starts
- M3: Reset R5
- M3: Copy to dst
- Start IPC
- IPC setup
- ROM starts Executing
- M3 out of reset
M3
- R5: Copy to buffers
- Init MMC
-R5 out of reset
- Enable caches
IMEM - 192K
L1D$ - 32KB
L1P$ - 32KB
L2$ - 512KB
DMEM - 80K
MSMC
SPL
OC-MSRAM
DDRSS
SRAM/CACHE
DRU
BOOT_ROM
GPU
MCU_ARMSS
MAIN NAVSS
R5F0
R5F1
Dual
Lockstep
I$ - 16KB
GTC
D$ - 16KB
TCM - 64KB
CBASS
tiboot3.bin
MCU NAVSS
UART
Other MAIN
peripherals
MMC SD
MCU Peripherals
R5 FLOW
DDR
Notes:
MPU CL0
MPU CL1
DMSC
- R5: Start IPC
- M3: Load boardcfg
M3: Init IPC
- R5: UART Init
- M3: Copy sci.bin
- R5: Enable caches
- R5: in reset
- R5: Init MMC
- M3- sysfw start
ROM - 160K
M3: R5 out of reset
- R5: Load sysfw
(sci.bin + board cfg)
- R5: SPL start
A53_0
A53_1
A53_0
WKUP peripherals
SPL
A53_0 EL3
M3
IMEM
IMEM - 192K
L1D$ - 32KB
L1P$ - 32KB
L2$ - 512KB
DMEM
DMEM - 80K
MSMC
sci.bin
SPL
OC-MSRAM
DDRSS
ATF
SRAM/CACHE
DRU
OPTEE
BOOT_ROM
GPU
MCU_ARMSS
MAIN NAVSS
R5F0
R5F1
Dual
Lockstep
I$ - 16KB
GTC
D$ - 16KB
TCM - 64KB
CBASS
sysfw.bin
tispl.bin
MCU NAVSS
Notes:
UART
Other MAIN
peripherals
MMC SD
- R5: Enable GTC
-R5: Load tispl.bin
- R5: A53 out of reset
- R5: DDR Init
- Current state
MCU Peripherals
A53 FLOW
- A53_0: Start ATF
- Current State
- FS Init
- Jump to userspace
A53_0: Relocate u-boot
A53 non-sec: start IPC
- A53_0: Load kernel+
dtb
A53_0: Load u-boot.img
A53 non-sec: IPC start
A53 sec: start IPC
- A53_0: Start Linux
- A53_0: Init MMC
- A53_0: Start u-boot
- A53_0: Start SPL
- A53_0: SMP Init
- A53: Switch to EL1
- A53_0: Init uart
- Standard Linux Init
MPU CL1
MPU CL0
DMSC
ROM - 160K
A53_0
A53_1
A53_0
WKUP peripherals
A53_1 EL3
A53_1 EL2
A53_1 EL1
A53_1 EL0
A53_0 EL1
A53_0 EL2
A53_1 EL1
A53_0 EL0
A53_0 EL3
A53_0 EL2
A53_0 EL3
A53_0 EL1
A53_0 EL0
A53_1 EL2
A53_1 EL0
A53_1 EL3
SPL
M3
IMEM
IMEM - 192K
Image
L1D$ - 32KB
L1P$ - 32KB
u-boot
L2$ - 512KB
DMEM - 80K
DMEM
dtb
MSMC
OC-MSRAM
DDRSS
ATF
SRAM/CACHE
DRU
OPTEE
BOOT_ROM
GPU
MCU_ARMSS
MAIN NAVSS
R5F0
R5F1
Dual
Lockstep
u-boot
I$ - 16KB
GTC
DDR
D$ - 16KB
TCM - 64KB
CBASS
Image + dtb
u-boot.img
MCU NAVSS
UART
Other MAIN
peripherals
MMC SD
MCU Peripherals
Q & A
Q&A
Congratulations....!!!!
Now you are a boot flow master.
Yay..!!!