This tutorial focuses on creating a GCC cross-compiler for your own operating system. This compiler that we build here will have a generic target (i686-elf) what allows you to leave the current operating system behind, meaning that no headers or libraries of your host operating system will be used. Hi Luigi, Just build the compiler for the m68k target. The soft-float is a command line option. You need something like: m68k-elf-gcc -mcpu=5475 -msoft-float.
Hardware
The memory map used by both eCos and RedBoot for the M5208EVBe is as follows:
Memory | Base | Length | Write-protected |
---|---|---|---|
External Flash | 0x00000000 | 0x00800000 | Yes |
External SDRAM | 0x40000000 | 0x02000000 | No |
Internal RAM | 0x80000000 | 0x00004000 | No |
On-chip Peripherals | 0xF0000000 | 0x10000000 | No |
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https://ameblo.jp/nephotica1984/entry-12631352299.html. For the older M5208EVB platform the eCos and RedBoot memory map is:
Memory | Base | Length | Write-protected |
---|---|---|---|
External Flash | 0x00000000 | 0x00200000 | Yes |
External SDRAM | 0x40000000 | 0x02000000 | No |
Internal RAM | 0x80000000 | 0x00004000 | No |
On-chip Peripherals | 0xF0000000 | 0x10000000 | No |
By default caching is enabled for the external flash and SDRAM. There is no need to cache the internal RAM, and caching the peripherals would break all device drivers. As a debugging aid the flash is set to write-protected, which should catch some null pointer indirections. The flash driver will temporarily set this part of the address space to read-write when modifying the flash.
For all startup types the M68K exception vectors, the eCos virtual vector table, and a small amount of additional data is placed at the base of SDRAM. For ROM startup the application's data starts immediately afterwards. For RAM and RAMBDM startup application code starts at 0x40010000, with just under 64K reserved for use by RedBoot, and data follows after the code.
M68k-elf-gcc
Typically the first 128K of flash is used for RedBoot, and the last 64K of flash is used for RedBoot's FIS and fconfig data. The remainder of the flash is available for use by the application, and is supported via the V2 AMD flash driver
CYGPKG_DEVS_FLASH_AMD_AM29XXXXX_V2
. That driver is inactive unless the generic flash support CYGPKG_IO_FLASH
has been included in the configuration. The amount of flash available is the main difference between the newer M5208EVBe board and the older M5208EVB. The default M5208EVBe platform HAL uses CFI to determine the actual flash chips present, with the M5208EVB being restricted to the known/fixed 2MB flash due to hardware mapping of the flash chip. The generic flash support provides an API that ensures an application need not worry about the details of which flash chips are present.
Code and data can be placed in the internal RAM using the linker script section “.iram_text” for code, and “.iram_data” and “.iram_bss” for initialized and unitialized data respectively. The M68K architectural HAL contains a testcase
iram1.c
which demonstrates how to use these linker sections.
Of the three on-chip UARTs, UART0 and UART1 have on-board RS232 transceivers and UART2 is available via GPIO configuration on the CN1 I/O header. Normally UART0 will be used as the default diagnostics channel for RedBoot and for stand-alone applications, and may also be inherited as the diagnostics/debug channel when debugging a RAM startup application over serial. Mac os x 10.6 download for macbook. Gintama episode 1 sub.
The on-chip ethernet device is supported via the device driver
CYGPKG_DEVS_ETH_MCFxxxx
. This driver will be inactive unless the generic ethernet support CYGPKG_IO_ETH_DRIVERS
Farming simulator 19 serial key cd key keygen - crack version. is included in the configuration. Typically that will happen automatically when the configuration is created using the net
template. For RedBoot or applications run on top of RedBoot the ethernet MAC address will typically be supplied by an fconfig setting. Otherwise the address will be set by a configuration option in the ethernet driver. Care should be taken that no two boards on the same network segment accidentally use the same MAC address.
https://edpomag.hatenablog.com/entry/2020/10/12/082345. The I²C bus is supported by the generic package
CYGPKG_IO_I2C
and the device driver CYGPKG_DEVS_I2C_MCFxxxx
. Both of these will be included automatically in any configuration for the M5208EVBe, but will be eliminated at link-time if the application does not use any I²C functionality. The I²C bus instance is called hal_mcfxxxx_i2c_bus
.
The QSPI bus is supported by the generic package
CYGPKG_IO_SPI
and the device driver CYGPKG_DEVS_SPI_MCFxxxx_QSPI
. Both of these will be included automatically in any configuration for the M5208EVBe, but will be eliminated at link-time if the application does not use any SPI functionality. The SPI bus instance is called hal_mcfxxxx_qspi_bus
, and the platform HAL also instantiates an SPI device object hal_m5208evbe_m13192
.
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Ready player one - come with me download torrent. All eCos configurations for the M5208EVBe also include a watchdog device driver
CYGPKG_DEVS_WATCHDOG_MCFxxxx_SCM
. That driver is inactive unless the generic watchdog support CYGPKG_IO_WATCHDOG
has been added to the configuration, and should be accessed via the API provided by that package.
eCos also manages the interrupt controllers, the FlexBus settings, and the SDRAM controller. The Crossbar switch is set to favour I/O rather than the cpu, avoiding problems with DMA underruns. Timer PIT0 is normally used for the eCos system clock, and when using the profiling package
CYGPKG_PROFILE_GPROF
PIT1 will be used for the profiling timer. The remaining hardware is available for use by the application.
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Host environmentIn this example it will be assumed that you are running Linux with the bash shell (or cygwin). We will only build the C compiler along with the assembler, linker and stuff. Note that the procedure is exactly the same if you are running cygwin on Windows, and on Macintosh OS X.Find your target CPUThe Archos Jukebox and Ondio models have an SH-1 CPU, so the target name is sh-elf.The iriver H-xxx, iAudio X5 and M5 models have a Coldfire CPU, so the target name is m68k-elf.The iPod, iriver IFP-7x0, iriver H10, m:robe, Sansa e200/c200/fuze/clip, D2, YH-xxx and Gigabeat F/X/S builds have ARM cores, so the target name is arm-elf-eabi.rockboxdev.shIn the tools/ directory of your checked out Rockbox source code, there's this shell script called rockboxdev.sh that will perform the cross-compiler installation for you fully automatically.When run, it will first prompt you for what architecture to build for, and then it'll proceed to download, unpack, build and install both binutils and the proper gcc version for you. If necessary it will even patch gcc accordingly.All compilers are installed to /usr/local/bin, which is usually in your PATH already. If it isn't, add it to the .bashrc file in your home directory.When using this script, you do not need to follow the rest of this instruction below this point. That is only for pure manual installation.Note for Ubuntu users: you will need build-essential and texinfo installed: sudo apt-get install build-essential texinfoNote for Cygwin users: the script may take up to 6-8 hours to complete, depending on your CPUNote for systems that have /tmp in ram: change the temp path at the top of rockboxdev.sh to avoid running out of spaceBelow is a list of stuff that must be installed before starting:
Download the toolchain source codeYou will need the following archives:
Download any required patches for your host and target
Target-specific notes:Coldfire (iAudio, iRiver)Note: For better (read: smaller) code, apply the patch gcc-3.4.6-rockbox-2.diff below. It changes how gcc selects between using multiplication and shift-and-add for some calculations. (It is a bit of a hack, because it affects more target CPU models than it should. Not a problem as long as you only use the compiler for Rockbox development.) - MagnusHolmgrenHost specific notes
(OS X) start the bash shellUnpack the archives(some may need to get the sources off CVS servers, as noted above)Apply patches if necessary (see the table above)Create the build treeChoose installed locationNow is the time to decide where you want the tools to be installed. This is the directory where all binaries, libraries, man pages and stuff end up when you do 'make install'.In this example I have chosen '/home/linus/sh1' as my installation directory, or prefix as it is called. Feel free to use any prefix, like /usr/local/sh1 for example.Build binutilsWe will start with building the binutils (the assembler, linker and stuff). This is pretty straightforward. We will be installing the whole tool chain in the /home/linus/sh1 directory.If you are building on a Macintosh OS X machine, you have to disable the precompiled headers: Then configure, make and install:Build GCCNow you are ready to build GCC. To do this, you must have the newly built binutils in the PATH.Then set the PATH, configure and make:Build GDBIf you are planning to debug your code with GDB, you have to build it as well.NOTE: If you are using GNU/Linux Ubuntu 8.10, you need to add the option '--disable-werror' to configure, like this:(Debian) Termcap dependency problemsIf you're using a Debian-based distribution, you may run into problems with termcap dependencies (see http://packages.debian.org/stable/oldlibs/termcap-compat).A workaround for this is to build termcap libs before building GDB:
Why don't you use version X.Y.Z of the compiler?Because the versions we use now works. We upgrade when it becomes necessary. Here's a small summary of some other versions we have tried:
r106 - 25 Apr 2017 - 08:53:40 - LorenzoMiori
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