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x86: Add more comments to the start-up code

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The full start-up sequence (TPL->SPL->U-Boot) can be a bit confusing since
each phase has its own 'start' file. Add comments to explain this.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2019-09-25 08:11:44 -06:00 committed by Bin Meng
parent 6172e94c3c
commit 08deb6d36f
3 changed files with 17 additions and 3 deletions
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12
arch/x86/cpu/start.S
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@ -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>
*

5
arch/x86/cpu/start_from_spl.S
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@ -1,7 +1,8 @@
/* SPDX-License-Identifier: GPL-2.0+ */
/*
* 32-bit x86 Startup Code when running from SPL
*
* 32-bit x86 Startup Code when running from SPL. This is the startup code in
* U-Boot proper, when SPL is used.
* Copyright 2018 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
*/

3
arch/x86/cpu/start_from_tpl.S
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@ -1,6 +1,7 @@
/* SPDX-License-Identifier: GPL-2.0+ */
/*
* 32-bit x86 Startup Code when running from TPL
* 32-bit x86 Startup Code when running from TPL. This is the startup code in
* SPL, when TPL is used.
*
* Copyright 2018 Google, Inc
* Written by Simon Glass <sjg@chromium.org>