RealView Emulation Baseboard Real-Time System Model User Guide: 3.2.1. Baseboard parameters

3.2.1. Baseboard parameters

Table 3.2 lists the EB RTSM instantiation time parameters that you can change when you start the model. The syntax to use in a configuration file is:

baseboard.component_name.parameter=value

Table 3.2. EBBaseboard Model instantiation parameters

Component name	Parameter	Description	Type	Values	Default
eb_sysregs_0	user_switches_ value	switch S6 setting	integer	see Switch S6	0
eb_sysregs_0	boot_switch_ value	switch S8 setting	integer	see Switch S8	0
flashldr_0	fname	path to flash image file	string	valid filename	[empty string]
flashldr_1	fname	path to flash image file	string	valid filename	[empty string]
mmc	p_mmc_file	multimedia card filename	string	valid filename	`mmc.dat`
pl111_clcd_0	pixel_double_ limit	sets threshold in horizontal pixels below which pixels sent to framebuffer doubled in size in both dimensions	integer	-	`0x12c`
smc	REMAP	indicates which channel of the SMC is bootable	integer	-1, 0-7	-1 (no remap)
sp810_sysctrl	use_s8	indicates whether to read boot_switches_value	boolean	true/false	false
vfs2	mount	mount point for the host filesystem	string	see Mount names	[empty string]

Switch S6

Switch S6 is equivalent to the Boot Monitor configuration switch on the EB hardware. Default settings are listed in Table 3.3. If you have the standard ARM Boot Monitor flash image loaded, the setting of switch S6-1 changes what happens on model reset. Otherwise, the function of switch S6 is implementation dependent. If you want to write the switch position directly to the S6 parameter in the model, you must convert the switch settings to an integer value from the equivalent binary, where 1 is on and 0 is off.

Table 3.3. Default positions for EB System Model switch S6

Switch	Default Position	Function in default position
S6-1	OFF	Displays prompt allowing Boot Monitor command entry after system start.
S6-2	OFF	See Table 3.4.
S6-3	OFF	See Table 3.4.
S6-4 to S6-8	OFF	Reserved for application use.

If S6-1 is in the ON position, the Boot Monitor executes the boot script that was loaded into flash. If there is no script, the Boot Monitor prompt is displayed.

The settings of S6-2 and S6-3 affect STDIO source and destination on model reset as defined in Table 3.4.

Table 3.4. STDIO redirection

S6-2	S6-3	Output	Input	Description
OFF	OFF	UART0	UART0	STDIO autodetects whether to use semihosting I/O or a UART. If a debugger is connected, STDIO is redirected to the debugger output window, otherwise STDIO goes to UART0.
OFF	ON	UART0	UART0	STDIO is redirected to UART0, regardless of semihosting settings.
ON	OFF	CLCD	Keyboard	STDIO is redirected to the CLCD and keyboard, regardless of semihosting settings.
ON	ON	CLCD	UART0	STDIO output is redirected to the LCD and input is redirected to the keyboard, regardless of semihosting settings.

Further information on Boot Monitor configuration and commands can be found in separate documentation. See the Emulation Baseboard User Guide (Lead Free).

Switch S8

Switch S8 is disabled by default. To enable it, before you start the model you must change the state of the parameter baseboard.sp810_sysctrl.use_s8 to true. See Baseboard parameters.

If you have a Boot Monitor flash image loaded, switch S8 allows you to remap boot memory. On reset, the EB hardware starts to execute code at 0x0, which is typically volatile DRAM. You can put the contents of non-volatile RAM at this location by setting the S8 switch in the EB RTSM CLCD as shown in Table 3.5. The settings take effect on model reset.

Table 3.5. EB System Model switch S8 settings

Switch S8[4:1]	Memory Range	Description
0000	`0x40000000` - `0x4FEFFFFF`	NOR flash remapped to `0x0`
0001	`0x44000000` - `0x47FFFFFF`	NOR flash remapped to `0x0`
0010	`0x48000000` - `0x4BFFFFFF`	SRAM remapped to `0x0`

Note

Attempting to change switch S8 settings after the model has started, for example by using the CLCD DIP switches, can lead to unpredictable behavior.

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