UP-X200 (serv.man9). Service Manual - Sharp EPOS Service Manual (repair manual). Page 6

UP-X200

Boot Loader

– 4 –

The boot loader fulfills the following functions.

• Normal Mode

Carries out initialisation of hardware and grants control to the CE
image located on the Disk On Chip.

•  Maintenance Mode (Displayed in QVGA mode)

The maintenance mode is invoked by pressing the [5] key while hold-
ing down the [Power] key.

Operations such as updating of the WindowsCE image, boot loader,

backup and restoring of the Disk On Chip image may be effected in
this mode.

•  Activation of Diagnostics for production.

Execution of Diagnostics on NOR for production.

• 2-side support

Reduces the possibility of failure to activate in the event of unfore-

seen accidents.

1

Boot Loader-2 is checked immediately after resetting and,
if enabled is executed. If disabled, Boot Loader-1 is executed.

2

Hardware initialization is carried out, the CPU set to the sleep mode
and power-on awaited (pressing the [Power] key). (All peripheral
devices should be either OFF or in power saving mode at this stage.)

3

Switching power on (by pressing the [Power] key) executes the
WindowsCE image on the Disk On Chip or Diagnostics.
When the WindowsCE image or Diagnostics does not exist on the
Flash ROM, the maintenance mode is invoked.

*

To determine the existence of the image, check whether or not the
program is stored in the specified area.

4

If the [5] key was pressed when power was switched on (by press-
ing the [Power] key), the maintenance mode is invoked.

*

A SUM check of Boot Loader-2 area is carried out when Boot
Loader-1 is activated and, if results are normal, processing is
shifted to Boot Loader-2.

*

Boot Loader-1 rewrites only in JTAG.

*

The Boot Loader-2 area is rewritten by "Boot Loader Update" on
the Boot Loader maintenance menu and the remote maintenance
function. (:

*

 1)

*1

Rewriting of Boot Loader-2 is effected from the OS of the
remote maintenance function ONEMINIT.

A simple menu is displayed in the maintenance mode from where
selections may be made using the numeric keypad.

*

If the [Power] key is pressed, CPU software is updated and the pro-

cess returned to awaiting input of the [Power] key.

*

Verification should be carried out to ensure that writing to and reading

from the Flash ROM have been correctly carried out.

Internal Boot Loader 
processing

Power on

Hardware initialization

Sleep mode

[Power] key  

pressed

WindowsCE activated

Normal mode

Maintenance mode

[Power] key  
pressed

0.EXIT selection

Key [5] pressed?

 

Image check

Boot Loader-2

enabled?

No 

Yes

No

Yes

No

Yes

No

Yes

No

Yes

Boot Loader-1 executed

Boot Loader-2 executed

1

2

4

 

[TRG1] key pressed?

 

Diag on NOR activated 
by PSPR = "0x8001"

 [CL] key pressed?

 

Diag on NOR activated 
by PSPR = "0x8002"

SYSTEM Menu Ver.X.XX

1.

OS Update

2.

Save all of ROM image

3.

Load all of ROM image

4.

Save part of ROM image

5.

Load part of ROM image

6.

DiskOnChip Format

7.

Boot Loader update

8.

Clear registry

0.

exit

1. OS Update

 Writes the WindowsONEMINIT image on the PC card
on the Disk On Chip.

2. Save all of ROM image Copies all images on the Flash to the PC card

(Except for the Boot Loader).
(Copying the ROM image leaves the Boot Loader 
unchanged)

3. Load all of ROM image

Writes all flash images on the PC card to the
Flash ROM (Writes images absorbed in 2 above).

4. Save part of ROM image

Copies the Flash disk area (including registry
information) onto the PC card (Absorbs with the
ROM  image unchanged)

5. Load part of ROM image

The Flash disk area copied onto the PC card in 4 
above is written on the Flash ROM. 
(Writes information absorbed in 4 above)

6. DiskOnChip Format 

The Flash is formatted. After entering the menu, 
formatting is carried out after rechecking.

7. Boot Loader Update 

The Boot Loader on the PC card is written to the Flash
ROM (Boot Loader-2 is rewritten).

8.Clear registry 

Registry information is initialized (Registry in the Flash ROM).

0. Exit 

The maintenance mode is terminated and
the WindowsONEMINIT in the Flash ROM is activated.

TRG1: 

Diagnostics on the NOR Flash is updated.

TRG2: 

Boot loader on the NOR Flash is updated.