Replicant

h1. I9250Bootloader

When connected on the serial port, during boot, if you press the volume down button and press enter on the serial console, you can get a shell:

<pre>

====== VCELL : 409625, SOC : 100, nType : 4 ======

[Charger] nScaledVCELL : 409625000, nDesriedSOC, : 98, nMaxSOC : 118, nMinSOC : 78

* FB base addr = 0xbea70000!

* PANEL_S6E8AA0_ID_READ : 0x12, 0x8e, 0x9b.

[ omap_power_get_reset_source :47]	 PRM_RSTST : 0x2

Autoboot (1 seconds) in progress, press any key to stop .

Autoboot aborted..

SBL> 

SBL> 

SBL> 

SBL> help

Following commands are supported:

* setenv

* saveenv

* printenv

* help

* reset

* boot

* kernel

* loadpart

* loadkernel

* erasepart

* omap_upload_rdx

* omap_test_button

* omap_test_hwinfo

* omap_set_gpio_level

* omap_get_gpio_level

* omap_test_twl6030

* omap_test_power

* omap_reboot

* omap_halt

* omap_cmdline_power

* omap_test_kbd

* omap_test_usbacc

* usb

* omap_test_max17043

* omap_test_fsa9480

* omap_dump_sec_log_buf

* omap_test_sud

To get commands help, Type "help <command>"

SBL> 

</pre>

<pre>

SBL> help setenv

* Help : setenv

* Usage : setenv [name] [value] . .

	Modify current environment info on ram

SBL> help saveenv

* Help : saveenv

* Usage : saveenv

	Save cuurent environment info to flash

SBL> help printenv

* Help : printenv

* Usage : printenv

	Print current environment info on ram

SBL> help help

* Help : help

* Usage : help [command]

SBL> help reset

* Help : reset

* Usage : reboot

Reboot system

SBL> help boot

* Help : boot

* Usage : boot [kernel options]

Boot Linux with optional kernel options

SBL> help kernel

* Help : kernel

* Usage : kernel hex_adr

Change the Linux kernel base

SBL> help loadpart

* Help : loadpart

* Usage : load partition from storage device.

SBL> help loadkernel

* Help : loadkernel

* Usage : load kernel from storage device.

SBL> help erasepart

* Help : erasepart

* Usage : erase partition.

SBL> help omap_upload_rdx

* Help : omap_upload_rdx

* Usage : [OMAP] upload RDX

	omap_upload_rdx

SBL> help omap_test_button

* Help : omap_test_button

* Usage : [OMAP] test OMAP buttons

	omap_test_button

SBL> help omap_test_hwinfo

* Help : omap_test_hwinfo

* Usage : [OMAP] test OMAP HW Information

	omap_test_hwinfo

SBL> help omap_set_gpio_level

* Help : omap_set_gpio_level

* Usage : [OMAP] set GPIO level

	omap_set_gpio_level {GPIO} {VALUE}

SBL> help omap_get_gpio_level

* Help : omap_get_gpio_level

* Usage : [OMAP] get GPIO level

	omap_get_gpio_level {GPIO}

SBL> help omap_test_twl6030

* Help : omap_test_twl6030

* Usage : [OMAP] test twl6030 device

	omap_test_twl6030

SBL> help omap_test_power

* Help : omap_test_power

* Usage : [OMAP] test power function

	omap_test_power

SBL> help omap_reboot

* Help : omap_reboot

* Usage : [OMAP] system reboot command

	omap_reboot

SBL> help omap_halt

* Help : omap_halt

* Usage : [OMAP] system halt command

	omap_halt

SBL> help omap_cmdline_power

* Help : omap_cmdline_power

* Usage : [OMAP] check kernel-cmdline by power

	omap_cmdline_power

SBL> help omap_test_kbd

* Help : omap_test_kbd

* Usage : [OMAP] test power function

	omap_test_kbd

SBL> help omap_test_usbacc

* Help : omap_test_usbacc

* Usage : [OMAP] test OMAP usb-accessary

	omap_test_usbacc

SBL> help usb

* Help : usb

* Usage : usb download command

SBL> help omap_test_max17043

* Help : omap_test_max17043

* Usage : [OMAP] test max17043 device

	omap_test_max17043

SBL> help omap_test_fsa9480

* Help : omap_test_fsa9480

* Usage : [OMAP] test fsa9480 device

	omap_test_fsa9480

SBL> help omap_dump_sec_log_buf

* Help : omap_dump_sec_log_buf

* Usage : [OMAP] dump sec-log-buf

	omap_dump_sec_log_buf

SBL> help omap_test_sud

* Help : omap_test_sud

* Usage : [OMAP] test SUD image

	omap_test_sud {NUMBER}

SBL> 

</pre>

<pre>

SBL> printenv

PARAM Rev 1.6

SERIAL_SPEED : 7

LOAD_RAMDISK : 0

BOOT_DELAY : 1

LCD_LEVEL : 6

SWITCH_SEL : 3

PHONE_DEBUG_ON : 0

LCD_DIM_LEVEL : 0

LCD_DIM_TIME : 6

MELODY_MODE : 1

REBOOT_MODE : 0

NATION_SEL : 0

LANGUAGE_SEL : 0

SET_DEFAULT_PARAM : 0

OFF_MODE_CHARGE : 1

FLASH_LOCK_STATUS : 0

VERSION : 

CMDLINE : 

DELTA_LOCATION : /mnt/rsv

WIFI_MAC_LINE : 

PARAM_STR_4 : DCM

</pre>

I've tried to modify the CMDLINE:

<pre>

SBL> setenv CMDLINE loglevel=8 console=ttyFIQ0 androidboot.console=ttyFIQ0

argv[0] : setenv

argv[1] : CMDLINE

argv[2] : loglevel=8 console=ttyFIQ0 androidboot.console=ttyFIQ0

value : 656175548

SBL> saveenv

save_param start block=49152, no.blocks=16384

</pre>

But once booted, "loglevel=8" wasn't found in /proc/cmdline on Replicant 6.0 0003 so it doesn't seem to have an impact. Though, on this bootloader, the commandline can also be modified by modifying the boot.img commandline parameters.

<pre>

SBL> omap_test_hwinfo

-----------------------------------------------------------

   OMAP-Samsung HW Information

   Board  Name : tuna  REV 9

   Board  Rev  : HSPA - 9

   Boot   Type : USB MMC1

   Device Type : HS

   Build Date  : Jan 24 2012 18:27:20

-----------------------------------------------------------

</pre>