ports/stm32: Make ETH DMA buffer attributes configurable.

Signed-off-by: Kwabena W. Agyeman <kwagyeman@live.com>

Author: kwagyeman

ports/stm32/eth.c

@@ -121,7 +121,7 @@ typedef struct _eth_t {
     int16_t (*phy_get_link_status)(uint32_t phy_addr);
 } eth_t;
 
-static eth_dma_t eth_dma __attribute__((aligned(16384)));
+static eth_dma_t eth_dma MICROPY_HW_ETH_DMA_ATTRIBUTE;
 
 eth_t eth_instance;
 

ports/stm32/mpconfigport.h

@@ -193,6 +193,10 @@ extern const struct _mp_obj_type_t network_lan_type;
 #define MICROPY_HW_NIC_ETH
 #endif
 
+#ifndef MICROPY_HW_ETH_DMA_ATTRIBUTE
+#define MICROPY_HW_ETH_DMA_ATTRIBUTE __attribute__((aligned(16384)));
+#endif
+
 #if MICROPY_PY_NETWORK_CYW43
 extern const struct _mp_obj_type_t mp_network_cyw43_type;
 #define MICROPY_HW_NIC_CYW43                { MP_ROM_QSTR(MP_QSTR_WLAN), MP_ROM_PTR(&mp_network_cyw43_type) },