diff options
| -rw-r--r-- | nuttx/configs/sama5d4-ek/src/dram_main.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/nuttx/configs/sama5d4-ek/src/dram_main.c b/nuttx/configs/sama5d4-ek/src/dram_main.c index 576bc0367..8f38a3ad3 100644 --- a/nuttx/configs/sama5d4-ek/src/dram_main.c +++ b/nuttx/configs/sama5d4-ek/src/dram_main.c @@ -103,6 +103,10 @@ int dram_main(int argc, char *argv) /* DRAM was already initialized at boot time, so we are ready to load the * Intel HEX stream into DRAM. + * + * Hmm.. With no hardware handshake, there is a possibility of data loss + * to overruning incoming data buffer. So far I have not seen this at + * 115200 8N1, but still it is a possibility. */ printf("Send Intel HEX file now\n"); @@ -121,11 +125,18 @@ int dram_main(int argc, char *argv) for(;;); } - /* No success indication.. The following cache/MMu operations will clobber + /* No success indication.. The following cache/MMU operations will clobber * any I/O that we attempt (Hmm.. unless, perhaps, if we delayed. But who * wants a delay?). */ + /* Flush the entire data cache assure that everything is in memory before + * we disable caching. + */ + + cp15_clean_dcache((uintptr_t)SAM_DDRCS_VSECTION, + (uintptr_t)(SAM_DDRCS_VSECTION + CONFIG_SAMA5_DDRCS_SIZE)); + /* Interrupts must be disabled through the following. In this configuration, * there should only be timer interrupts. Your NuttX configuration must use * CONFIG_SERIAL_LOWCONSOLE=y or printf() will hang when the interrupts |