u-boot/board/google/common/early_init.S

/* SPDX-License-Identifier: GPL-2.0+ */
/*
 * Copyright (c) 2014 Google, Inc
 */

.globl early_board_init
early_board_init:
	/* Enable post codes to EC */
#ifdef CONFIG_EARLY_POST_CROS_EC
	mov    $0x1b, %ecx
	rdmsr
	and    $0x100, %eax
	test   %eax, %eax
	je     1f

	mov    $0x8000f8f0, %eax
	mov    $0xcf8, %dx
	out    %eax, (%dx)
	mov    $0xfed1c001, %eax
	mov    $0xcfc, %dx
	out    %eax, (%dx)
	mov    $0xfed1f410, %esp
	mov    (%esp), %eax
	and    $0xfffffffb, %eax
	mov    %eax, (%esp)
1:
#endif
	jmp	early_board_init_ret
SPDX: Convert all of our single license tags to Linux Kernel style When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com> 2018-05-06 21:58:06 +00:00			`/* SPDX-License-Identifier: GPL-2.0+ */`
x86: Add chromebook_link board This board is a 'bare' version of the existing 'link 'board. It does not require coreboot to run, but is intended to start directly from the reset vector. This initial commit has place holders for a wide range of features. These will be added in follow-on patches and series. So far it cannot be booted as there is no ROM image produced, but it does build without errors. Signed-off-by: Simon Glass <sjg@chromium.org> 2014-11-13 05:42:07 +00:00			`/*`
			`* Copyright (c) 2014 Google, Inc`
			`*/`

			`.globl early_board_init`
			`early_board_init:`
x86: Emit post codes in startup code for Chromebooks On x86 it is common to use 'post codes' which are 8-bit hex values emitted from the code and visible to the user. Traditionally two 7-segment displays were made available on the motherboard to show the last post code that was emitted. This allows diagnosis of a boot problem since it is possible to see where the code got to before it died. On modern hardware these codes are not normally visible. On Chromebooks they are displayed by the Embedded Controller (EC), so it is useful to emit them. We must enable this feature for the EC to see the codes, so add an option for this. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> 2014-11-13 05:42:09 +00:00			`/* Enable post codes to EC */`
			`#ifdef CONFIG_EARLY_POST_CROS_EC`
			`mov $0x1b, %ecx`
			`rdmsr`
			`and $0x100, %eax`
			`test %eax, %eax`
			`je 1f`

			`mov $0x8000f8f0, %eax`
			`mov $0xcf8, %dx`
			`out %eax, (%dx)`
			`mov $0xfed1c001, %eax`
			`mov $0xcfc, %dx`
			`out %eax, (%dx)`
			`mov $0xfed1f410, %esp`
			`mov (%esp), %eax`
			`and $0xfffffffb, %eax`
			`mov %eax, (%esp)`
			`1:`
			`#endif`
x86: Add chromebook_link board This board is a 'bare' version of the existing 'link 'board. It does not require coreboot to run, but is intended to start directly from the reset vector. This initial commit has place holders for a wide range of features. These will be added in follow-on patches and series. So far it cannot be booted as there is no ROM image produced, but it does build without errors. Signed-off-by: Simon Glass <sjg@chromium.org> 2014-11-13 05:42:07 +00:00			`jmp early_board_init_ret`