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Posted to commits@nuttx.apache.org by xi...@apache.org on 2023/02/21 17:28:03 UTC
[nuttx] 02/03: arch: imxrt: Enable IMXRT_ENET_ENHANCEDBD if !ARMV7M_DCACHE_WRITETHROUGH
This is an automated email from the ASF dual-hosted git repository.
xiaoxiang pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/nuttx.git
commit 69e6e17407da5df34a46328d7314bbc68c8a613e
Author: Masayuki Ishikawa <ma...@gmail.com>
AuthorDate: Mon Feb 20 16:42:01 2023 +0900
arch: imxrt: Enable IMXRT_ENET_ENHANCEDBD if !ARMV7M_DCACHE_WRITETHROUGH
Summary:
- I noticed that there are two kinds of descriptors for imxrt_enet.c
- The first one is the legacy descriptor and its size is 8bytes.
- The second one is the enhanced descriptor and its size is 32bytes.
- In both cases, we can not use a descriptor chain like stm32.
- Considering cache line alignment, the second one is perfect because
one descriptor fits the Cortex-M7 cache line which would fix networking
stability issues in d-cache write-back mode.
Impact:
- imxrt ethernet in d-cache write-back mode
Testing:
- Tested with ixmrt1060-evk:netnsh_dcache_wb (will be added later)
Signed-off-by: Masayuki Ishikawa <Ma...@jp.sony.com>
---
arch/arm/src/imxrt/Kconfig | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/arm/src/imxrt/Kconfig b/arch/arm/src/imxrt/Kconfig
index ead7d7919d..5dc6c436cb 100644
--- a/arch/arm/src/imxrt/Kconfig
+++ b/arch/arm/src/imxrt/Kconfig
@@ -2070,7 +2070,8 @@ config IMXRT_ENET_NTXBUFFERS
config IMXRT_ENET_ENHANCEDBD
bool # not optional
- default n
+ default n if ARMV7M_DCACHE_WRITETHROUGH
+ default y if !ARMV7M_DCACHE_WRITETHROUGH
config IMXRT_ENET_NETHIFS
int # Not optional