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Add initial support for the ASPEED AST2700, an arm64 (Cortex-A35)
Baseboard Management Controller (BMC) SoC. AST2700 is Aspeed's 8th
generation BMC and uses a dual-die architecture: SoC0 (the "CPU"
die) hosts the four Cortex-A35 cores and its own SCU at 0x12c02000,
while SoC1 (the "IO" die) hosts the peripherals and its own SCU at
0x14c02000.
This commit adds:
- ASPEED_AST2700 Kconfig option and the ast2700 mach subdir
(mach Makefile, ast2700/Kconfig, board/aspeed/evb_ast2700/*)
- arm64 MMU map covering the SoC device window and the DRAM
region at 0x4_0000_0000 (up to 8 GiB)
- lowlevel_init.S for early CPU bring-up
- cpu-info: print SoC ID (AST2700/2720/2750 A0/A1/A2 variants)
and reset cause (cold reset, EXT reset, WDT reset)
- board_common: dram_init via UCLASS_RAM, AHBC timeout init
- platform: env_get_location() that selects SPI/eMMC based on
the IO-die HW strap; arch_misc_init() that exposes
${boot_device} and ${verify} to the boot script
- SCU0/SCU1 register layout header (scu_ast2700.h)
- configs/evb-ast2700_defconfig and include/configs/evb_ast2700.h
for the AST2700 EVB board
The defconfig depends on ast2700-evb.dts, which is introduced in
a subsequent patch; this commit must be applied with the
remaining series for evb-ast2700_defconfig to build.
Signed-off-by: Ryan Chen <[email protected]>
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Add low level platform initialization for the AST2600 SoC.
The 2-stage booting with U-Boot SPL are leveraged to support
different booting mode.
However, currently the patch supports only the booting from
memory-mapped SPI flash.
Signed-off-by: Chia-Wei, Wang <[email protected]>
Reviewed-by: Ryan Chen <[email protected]>
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Rename the ast2500-board.c to board_common.c and
place the renamed file under the ast2500 folder.
Signed-off-by: Chia-Wei, Wang <[email protected]>
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When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from. So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry. Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.
In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.
This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents. There's also a few places where I found we did not have a tag
and have introduced one.
Signed-off-by: Tom Rini <[email protected]>
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Add configuration file with parameters that are very likely to be shared by
all ast2500-based boards.
Add ast2500-board.c file with the init code that is very likely to be
shared by all ast2500-based boards.
Reviewed-by: Simon Glass <[email protected]>
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Clock Driver
This driver is ast2500-specific and is not compatible with earlier
versions of this chip. The differences are not that big, but they are
in somewhat random places, so making it compatible with ast2400 is not
worth the effort at the moment.
SDRAM MC driver
The driver is very ast2500-specific and is completely incompatible
with previous versions of the chip.
The memory controller is very poorly documented by Aspeed in the
datasheet, with any mention of the whole range of registers missing. The
initialization procedure has been basically taken from Aspeed SDK, where
it is implemented in assembly. Here it is rewritten in C, with very limited
understanding of what exactly it is doing.
Reviewed-by: Simon Glass <[email protected]>
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Add support for Watchdog Timer, which is compatible with AST2400 and
AST2500 watchdogs. There is no uclass for Watchdog yet, so the driver
does not follow the driver model. It also uses fixed clock, so no clock
driver is needed.
Add support for timer for Aspeed ast2400/ast2500 devices.
The driver actually controls several devices, but because all devices
share the same Control Register, it is somewhat difficult to completely
decouple them. Since only one timer is needed at the moment, this should
be OK. The timer uses fixed clock, so does not rely on a clock driver.
Add sysreset driver, which uses watchdog timer to do resets and particular
watchdog device to use is hardcoded (0)
Reviewed-by: Simon Glass <[email protected]>
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