X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=src%2Fstmf0%2Fao_flash_stm.c;h=2d57eea72701eefeae6e61ad0a6fc0395cf2dac7;hb=c4b8aff07d5366cef2c7209729f6cd22fa67de0c;hp=2aeff3880fce13f3a91ec545276d8e9ab797538c;hpb=1085ec5d57e0ed5d132f2bbdac1a0b6a32c0ab4a;p=fw%2Faltos

diff --git a/src/stmf0/ao_flash_stm.c b/src/stmf0/ao_flash_stm.c
index 2aeff388..2d57eea7 100644
--- a/src/stmf0/ao_flash_stm.c
+++ b/src/stmf0/ao_flash_stm.c
@@ -19,6 +19,12 @@
 #include <ao.h>
 #include <ao_flash.h>
 
+/* Note that the HSI clock must be running for this code to work.
+ * Also, special care must be taken with the linker to ensure that the
+ * functions marked 'ramtext' land in ram and not rom. An example of that
+ * can be found in altos-loader.ld
+ */
+
 static uint8_t
 ao_flash_is_locked(void)
 {
@@ -44,12 +50,7 @@ ao_flash_lock(void)
 	stm_flash.cr |= (1 << STM_FLASH_CR_LOCK);
 }
 
-static void
-ao_flash_wait_bsy(void)
-{
-	while (stm_flash.sr & (1 << STM_FLASH_SR_BSY))
-		;
-}
+#define ao_flash_wait_bsy() do { while (stm_flash.sr & (1 << STM_FLASH_SR_BSY)); } while (0)
 
 static void __attribute__ ((section(".ramtext"),noinline))
 _ao_flash_erase_page(uint32_t *page)