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arch: imxrt: Enable IMXRT_ENET_ENHANCEDBD if !ARMV7M_DCACHE_WRITETHROUGH

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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 <Masayuki.Ishikawa@jp.sony.com>
This commit is contained in:
Masayuki Ishikawa 2023-02-20 16:42:01 +09:00 committed by Xiang Xiao
parent 3a4542f3c4
commit 69e6e17407
1 changed files with 2 additions and 1 deletions
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3
arch/arm/src/imxrt/Kconfig
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@ -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