From c435f663b0547c7ac4104b0df49919b2037048be Mon Sep 17 00:00:00 2001 From: rusefi Date: Wed, 17 May 2017 20:29:22 -0400 Subject: [PATCH] docs --- firmware/global.h | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/firmware/global.h b/firmware/global.h index c89bc7b80f..f32db92001 100644 --- a/firmware/global.h +++ b/firmware/global.h @@ -64,6 +64,12 @@ typedef unsigned int time_t; #endif +/** + * rusEfi is placing some of data structures into CCM memory simply + * in order to use that memory - no magic about which RAM is faster etc. + * + * Please note that DMA does not work with CCM memory + */ #if EFI_USE_CCM && defined __GNUC__ #define CCM_OPTIONAL __attribute__((section(".ram4"))) #elif defined __GNUC__