I'm trying to create a new nv_uboot-snow-usb.kpart file changing some parameters inside the file snow.h file, but the modifications I made aren't detected.
Mario Marietto
marietto2008 at gmail.com
Sun Feb 4 13:31:27 CET 2024
Hello.
My ARM Chromebook SNOW model has the mmc slot broken,but I've realized
that I can boot Linux using the USB port ! To enable the booting of Linux
via USB
I have modified this file :
https://github.com/virtualopensystems/u-boot/blob/eecfeb578e296ef3b739ac918a39b6c177dff58a/include/configs/snow.h#L101
in this way :
/*
* Copyright (C) 2013 - Virtual Open Systems
* Author: Nikolay Nikolaev <n.nikolaev at virtualopensystems.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef __configs_snow_h__
#define __configs_snow_h__
#include <configs/smdk5250.h>
#undef CONFIG_DEFAULT_DEVICE_TREE
#define CONFIG_DEFAULT_DEVICE_TREE exynos5250-snow
/* Generally verified boot needs more heap space */
#undef CONFIG_SYS_MALLOC_LEN
#define CONFIG_SYS_MALLOC_LEN (32 << 20)
#define CONFIG_INITRD_ADDRESS 0x44000000
#include <configs/chromeos.h>
/* Disable ChromeOS specifics */
#undef CONFIG_CHROMEOS
/* Force reading the environment */
#undef CONFIG_OF_LOAD_ENVIRONMENT
#define CONFIG_CHROMEOS_USB
/* Support vboot flag reading from GPIO hardwrae */
#define CONFIG_CHROMEOS_GPIO_FLAG
/* Support vboot flag reading from EC */
#define CONFIG_CHROMEOS_MKBP_FLAG
/* Use the default arch_phys_memset implementation */
#define CONFIG_PHYSMEM
/* Adjust the display resolution. */
#undef MAIN_VRESOL_VAL
#undef MAIN_HRESOL_VAL
#define MAIN_VRESOL_VAL 0x300
#define MAIN_HRESOL_VAL 0x556
#undef LCD_XRES
#undef LCD_YRES
#define LCD_XRES 1366
#define LCD_YRES 768
#define CONFIG_SYS_WHITE_ON_BLACK
/*
* Extra bootargs used for direct booting, but not for vboot.
* - console of the board
* - debug and earlyprintk: easier to debug; they could be removed later
*/
#define CONFIG_DIRECT_BOOTARGS \
"console=tty1 debug clk_ignore_unused"
/* Standard input, output and error device of U-Boot console. */
#define CONFIG_STD_DEVICES_SETTINGS EXYNOS_DEVICE_SETTINGS
#define CONFIG_CHROMEOS_SD_TO_SPI \
"sd_to_spi=echo Flashing U-Boot from SD card to SPI flash; " \
"if mmc dev 1 && " \
"mmc rescan && " \
"mmc read 40008000 1 1000 && " \
"sf probe 1:0 && " \
"sf update 40008000 0 80000; then " \
"echo Flash completed; else " \
"echo Flash failed; " \
"fi\0"
/* Replace default CONFIG_EXTRA_ENV_SETTINGS */
#ifdef CONFIG_EXTRA_ENV_SETTINGS
#undef CONFIG_EXTRA_ENV_SETTINGS
#endif
#define CONFIG_EXTRA_ENV_SETTINGS \
EXYNOS_DEVICE_SETTINGS \
"dtaddr=0x43000000\0"\
"initrdaddr=0x44000000\0"\
"boot_noinitrd=usb start ; usb dev 0 ; ext2load usb 0:2 ${loadaddr}
uImage ; ext2load usb 0:2 ${dtaddr} exynos5250-snow.dtb ; bootm
${loadaddr} - ${dtaddr}\0"\
"boot_initrd=usb start ; usb dev 0 ; ext2load usb 0:2 ${loadaddr}
uImage ; ext2load usb 0:2 ${initrdaddr} initrd ; ext2load usb 0:2
${dtaddr} exynos5250-snow.dtb ; bootm ${loadaddr} ${initrdaddr}
${dtaddr}\0"\
"bootdelay=10\0"
#ifdef CONFIG_BOOTARGS
#undef CONFIG_BOOTARGS
#endif
#define CONFIG_BOOTARGS \
"console=tty1 root=/dev/da0p4 rw rootwait clk_ignore_unused --no-log"
/* Replace default CONFIG_BOOTCOMMAND */
#ifdef CONFIG_BOOTCOMMAND
#undef CONFIG_BOOTCOMMAND
#endif
#define CONFIG_BOOTCOMMAND \
"run boot_noinitrd"
/* Enable splash screens */
#define CONFIG_CROS_SPLASH
/* Enable simple framebuffer */
#define CONFIG_SIMPLEFB
/* Enable writing on a FAT formatted filesystem */
#define CONFIG_FAT_WRITE
/* Enable virt mode commands */
#define CONFIG_ARMV7_VIRT
/* Disable d-cache */
#define CONFIG_SYS_DCACHE_OFF
#endif /* __configs_snow_h__ */
I have modified mmc with usb 0 and I've changed the timeout from
"bootdelay=3\0"
to "bootdelay=10\0" and I ran the script that located here :
https://github.com/virtualopensystems/u-boot/blob/eecfeb578e296ef3b739ac918a39b6c177dff58a/scripts/build.sh
that creates a new : nv_uboot-snow-usb.kpart file,that I install on the sd
card where
I have installed Linux,using the following commands :
# dd if=/dev/zero of=/dev/sdi1
dd: writing to '/dev/sdi1': No space left on device
32769+0 records in
32768+0 records out
16777216 bytes (17 MB, 16 MiB) copied, 2.07775 s, 8.1 MB/s
# sudo dd if=nv_uboot-snow-usb.kpart of=/dev/sdi1
At this point I attach the usb to sd card converter on the Chromebook and I
try to
boot Linux,but to my surprise I see that the bootloader is still set to 3
seconds.
It means that for some reason,the new nv_uboot-snow-usb.kpart is not
detected,
because when I have recompiled it,I have chosen 10 seconds of timeout for
u-boot.
I really don't have any idea of the reasons why the new settings aren't
applied.
--
Mario.
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