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>