2.1 Nios-specific Options/Settings
-----------------------------------
All configuration options/settings that are specific to Nios begin
-with "CONFIG_NIOS_", "CFG_NIOS_", or "CFG_NIOS_CPU_".
+with "CONFIG_NIOS_", "CONFIG_SYS_NIOS_", or "CONFIG_SYS_NIOS_CPU_".
The configuration follows a two-stage process. In the first stage
the NIOS CPU core will defined like defined in Alteras SOPC Builder.
-At this point we use the "CFG_NIOS_CPU_" defines exclusively. For
+At this point we use the "CONFIG_SYS_NIOS_CPU_" defines exclusively. For
more informations about all the definitions you have to setup see
into current board configurations and doc/README.nios_CFG_NIOS_CPU.
CONFIG_NIOS -- defined for all Nios-32 boards.
-CFG_NIOS_CONSOLE -- the base address of the console UART or the JTAG
+CONFIG_SYS_NIOS_CONSOLE -- the base address of the console UART or the JTAG
stdio port. To enable a console via JTAG, define
CONFIG_CONSOLE_JTAG and set CGF_NIOS_CONSOLE to the base address
of the JTAG stdio port (normally OCI base + 0x00fa). Then
run nios-console with the -w option.
(standard-32: nasys_uart_0 resp. na_uart1_base).
-CFG_NIOS_FIXEDBAUD -- defined if the console UART PTF fixed_baud
+CONFIG_SYS_NIOS_FIXEDBAUD -- defined if the console UART PTF fixed_baud
parameter is set to '1'.
-CFG_NIOS_MULT_HW -- use full hardware multiply (not yet implemented).
+CONFIG_SYS_NIOS_MULT_HW -- use full hardware multiply (not yet implemented).
-CFG_NIOS_MULT_MSTEP -- use hardware assisted multiply using the
+CONFIG_SYS_NIOS_MULT_MSTEP -- use hardware assisted multiply using the
MSTEP instruction (not yet implemented).
-CFG_NIOS_TMRBASE -- the base address of the timer used to support
+CONFIG_SYS_NIOS_TMRBASE -- the base address of the timer used to support
xxx_timer routines (e.g. set_timer(), get_timer(), etc.).
(standard-32: nasys_timer_1 resp. na_lo_priority_timer2_base).
-CFG_NIOS_TMRIRQ -- the interrupt request (vector number) assigned to
+CONFIG_SYS_NIOS_TMRIRQ -- the interrupt request (vector number) assigned to
the timer. (standard-32: nasys_timer_1_irq resp.
na_low_priority_timer2_irq).
-CFG_NIOS_TMRMS -- the period of the timer in milliseconds.
+CONFIG_SYS_NIOS_TMRMS -- the period of the timer in milliseconds.
-CFG_NIOS_TMRCNT -- the preloadable counter value for the timer if it has
+CONFIG_SYS_NIOS_TMRCNT -- the preloadable counter value for the timer if it has
no fixed period.
-CFG_NIOS_ASMIBASE -- the base address of the ASMI peripheral.
+CONFIG_SYS_NIOS_ASMIBASE -- the base address of the ASMI peripheral.
(standard-32: na_asmi_base).
-CFG_NIOS_SPIBASE -- the base address of the SPI master (!) peripheral.
+CONFIG_SYS_NIOS_SPIBASE -- the base address of the SPI master (!) peripheral.
(nasys_spi_0)
-CFG_NIOS_SPIBITS -- the amount of configured SPI data bits in PTF.
+CONFIG_SYS_NIOS_SPIBITS -- the amount of configured SPI data bits in PTF.
This value can be 8 or 16 only! (PTF: databits)
Some 'standard' U-Boot options/settings are treated differently in
the Nios port. These are described below.
-CFG_GBL_DATA_OFFSET -- in the Nios port, this is the offset of the
+CONFIG_SYS_GBL_DATA_OFFSET -- in the Nios port, this is the offset of the
global data structure in the Nios memory space. More simply,
the address of global data.
4.1 Boot process over GERMS
---------------------------
When the NIOS CPU catch a reset signal it will begin to be running
-code from CFG_NIOS_CPU_RST_VECT. Normally at this place it will
+code from CONFIG_SYS_NIOS_CPU_RST_VECT. Normally at this place it will
find the GERMS monitor. That's the case for the generic NIOS CPU
configuration "standard_32". When the GERMS monitor starts running,
it performs important system initializations and then looks for
executable code in flash, using the following steps:
- 1. Examining the two bytes at CFG_NIOS_CPU_FLASH_BASE + 0x04000C.
- 2. Examining the button 0 on the PIO CFG_NIOS_CPU_BUTTON_PIO.
+ 1. Examining the two bytes at CONFIG_SYS_NIOS_CPU_FLASH_BASE + 0x04000C.
+ 2. Examining the button 0 on the PIO CONFIG_SYS_NIOS_CPU_BUTTON_PIO.
3. If the button is not pressed and the two bytes contain 'N'
and 'i', the monitor executes a CALL to location
- CFG_NIOS_CPU_FLASH_BASE + 0x040000.
+ CONFIG_SYS_NIOS_CPU_FLASH_BASE + 0x040000.
4. If the code is not executed in step 3 or the code returns,
then prints an 8-digit version number to STDOUT and waits for
user commands from STDIN.
immediately executes the code. To return program execution to the
GERMS monitor (that is, avoid running code stored in flash memory):
- 1. Hold down CFG_NIOS_CPU_BUTTON_PIO, button number 0.
+ 1. Hold down CONFIG_SYS_NIOS_CPU_BUTTON_PIO, button number 0.
2. Press then release the CPU reset button.
- 3. Release CFG_NIOS_CPU_BUTTON_PIO, button number 0.
+ 3. Release CONFIG_SYS_NIOS_CPU_BUTTON_PIO, button number 0.
5. DEBUGGING WITH GDB
-Add boot support for ucLinux (niosnommu).
-Implement (don't copy Altera code) the __mulxx routines using the
- MSTEP and MUL instructions (e.g. CFG_NIOS_MULT_HW and CFG_NIOS_MULT_MSTEP).
+ MSTEP and MUL instructions (e.g. CONFIG_SYS_NIOS_MULT_HW and CONFIG_SYS_NIOS_MULT_MSTEP).
Regards,
projects / platform / kernel / u-boot.git / blobdiff