NET+OS 6.1 Training

NET+OS 6.1 Training NetSilicon & Digi Confidential

Debugging NetSilicon & Digi Confidential

SDRAM Memory settings • Settings.s contains the memory controller register settings for SDRAM. (not in debugger) • If you use different memory parts you must modify this file (PC133). • RAS and CAS Delay Registers • Dynamic memory configuration registers NetSilicon & Digi Confidential

SRAM (flash) • Table defined in bsp.c defines the register settings for SRAM parts • SRAM memory configuration registers, specifies 16 bit or 32-bit. • Static memory Read Delay registers NetSilicon & Digi Confidential

Remember…. • To modify defines in bsp.h to enable drivers • We now have four serial ports, two are UART and one is SPI and one is not connected. • The boards default to support USB host • Only big endian is supported • There is no EEPROM support for NVRAM NetSilicon & Digi Confidential

Using the Majic Debugger • Initialization Script • JTAG Reset Issue • Debugging with GDB • Debugging with Green Hills NetSilicon & Digi Confidential

Initialization Script • The debugger initialization file is called ns9750_a.cmd • Initializes SDRAM on CS4 • For different types of SDRAM you will have to modify this script • Sets a bit in an SCM register to tell the code that we are in the debugger • Same script works for GNU and Green Hills NetSilicon & Digi Confidential

Initialization Script • Uses monitor commands to read and write registers. • These commands are described in the EPI documentation provided with NET+OS • Sets up the memory controller registers which are described in the HW reference guide NetSilicon & Digi Confidential

Monitor commands • Monitor commands can be used in the MONICE low level debugger • The MONICE debugger is helpful in board bring up, allows you to read/write memory and has built in memory test. • You can create an icon for the MONICE debugger using the majic setup wizard • ew = enter word, dw = display word NetSilicon & Digi Confidential

Initialization: (cont) • // • // Minimal memory controller initialization--just enough to allow code • // to be downloaded. Boot code will do the rest. • // • ew 0xA0700000 = 0x00000001 // Enable the memory controller. • ew 0xA0700024 = 0x00000006 // Set the refresh counter, 60 is optimal, 30 is safer for now • ew 0xA0700028 = 0x00000001 // • ew 0xA0700030 = 0x00000001 // Set the precharge period • ew 0xA0700034 = 0x00000004 // Active to precharge command period is 16 clock cycles • ew 0xA070003C = 0x00000001 // tAPR • ew 0xA0700040 = 0x00000005 // tDAL • ew 0xA0700044 = 0x00000001 // tWR • ew 0xA0700048 = 0x00000006 // tRC 32 clock cycles • ew 0xA070004C = 0x00000006 // tRFC 32 clock cycles NetSilicon & Digi Confidential

Using the majic with GNU • All debugger files are setup by the majic setup wizzard • Epimdi.cfg - Contains the units IP address - processor type and endianess - This file should not have to modified • Startice.cmd - You do not have to modify this file - Contains JTAG configuration commands • ns9750_a.cmd - SDRAM initialization commands NetSilicon & Digi Confidential

JTAG Reset Issue • Cannot run the debugger if there is code in flash (runs unstable) • We don’t have a fix for this yet. • Fixed in the next version of Mercury • Before you power on the board you need to put jumper J1 ON if there is code in flash • Once you start the debugger you can remove JI, this is error prone. You need to remove this jumper before you access flash (NVRAM) NetSilicon & Digi Confidential

GNU Debugging (Cont) • In your applications 32b directory “make gdbinit” This will create a .gdbinit file in your 32b directory. You only need to do this once. The .gdinit file is the initialization file for gdb. And contains the monitor load command. • Type “xtools arm-elf” to specify the processor type NetSilicon & Digi Confidential

GNU Debugging • Put J1 on if there is code in flash • Power on the board • Type gdbtk –se image.elf, the code will start downloading to the board • Remove J1, if you need to access flash • You are now ready to debug. NetSilicon & Digi Confidential

Debugging with GHS • Debugger files are located in /ghs/arm361 and are setup by the installer • rdimajic.cfg - IP address - Processor type, endian • startice.cmd and ns9750_a.cmd, same as GNU • Put J1 on if necessary and Power on board • Start multi and build your application NetSilicon & Digi Confidential

Debugging with GHS (cont) • Click on download to target • rdiserv –ice –nobss –big • You can remove the jumper once the code starts to download, if you need to access flash. • You can now start debugging NetSilicon & Digi Confidential

NET+OS 6.1 Training