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Diffstat (limited to 'arch/x86/cpu/start.S')
| -rw-r--r-- | arch/x86/cpu/start.S | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/x86/cpu/start.S b/arch/x86/cpu/start.S index 9b763942743..01524635e9c 100644 --- a/arch/x86/cpu/start.S +++ b/arch/x86/cpu/start.S @@ -2,6 +2,18 @@ /* * U-Boot - x86 Startup Code * + * This is always the first code to run from the U-Boot source. To spell it out: + * + * 1. When TPL (Tertiary Program Loader) is enabled, the boot flow is + * TPL->SPL->U-Boot and this file is used for TPL. Then start_from_tpl.S is used + * for SPL and start_from_spl.S is used for U-Boot proper. + * + * 2. When SPL (Secondary Program Loader) is enabled, but not TPL, the boot + * flow is SPL->U-Boot and this file is used for SPL. Then start_from_spl.S is + * used for U-Boot proper. + * + * 3. When neither TPL nor SPL is used, this file is used for U-Boot proper. + * * (C) Copyright 2008-2011 * Graeme Russ, <graeme.russ@gmail.com> * |