boards/arm/stm32h7/stm32h745i-disco: supported external SDRAM #10198
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
|
@a-lunev please include the Summary in the commit log message. Maybe even the Testing example could be included there! |
a-lunev
force-pushed
the
stm32h745i-disco_sdram
branch
from
9deb0ea
to
50ded59
Compare
Done. |
acassis
approved these changes
Aug 11, 2023
pkarashchenko
approved these changes
Aug 11, 2023
Supported external SDRAM (MT48LC4M32B2B5-6AIT:L) on STM32H745I-DISCO dev board. Though MT48LC4M32B2B5-6AIT:L SDRAM itself provides 32-bit data bus, STM32H745I-DISCO board routes only DQ[15:0] bits. Thus only half of the memory can be accessed: the accessible memory configuration is only 1 Meg x 16 x 4 banks instead of 1 Meg x 32 x 4 banks. Thus the accessible memory size is 8 MBytes. Testing: nsh> ramtest -a 0xD0000000 -s 8388608 RAMTest: Marching ones: d0000000 8388608 RAMTest: Marching zeroes: d0000000 8388608 RAMTest: Pattern test: d0000000 8388608 55555555 aaaaaaaa RAMTest: Pattern test: d0000000 8388608 66666666 99999999 RAMTest: Pattern test: d0000000 8388608 33333333 cccccccc RAMTest: Address-in-address test: d0000000 8388608 nsh>
a-lunev
force-pushed
the
stm32h745i-disco_sdram
branch
from
50ded59
to
a6d45e0
Compare
xiaoxiang781216
approved these changes
Aug 12, 2023
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Summary
Supported external SDRAM (MT48LC4M32B2B5-6AIT:L) on STM32H745I-DISCO dev board.
Though MT48LC4M32B2B5-6AIT:L SDRAM itself provides 32-bit data bus, STM32H745I-DISCO board routes only DQ[15:0] bits. Thus only half of the memory can be accessed: the accessible memory configuration is only 1 Meg x 16 x 4 banks instead of 1 Meg x 32 x 4 banks. Thus the accessible memory size is 8 MBytes.
Impact
STM32H745I-DISCO dev board
Testing