| 1 | TSAR BOOT LOADER
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| 2 |
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| 3 | Files:
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| 4 | ===============================================================================
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| 5 | src/ Source files
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| 6 | The entry point of this boot loader is the file reset.S
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| 7 |
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| 8 | include/ Header files
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| 9 |
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| 10 | conf/ Platform specific files and ldscript.
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| 11 | For each platform, we must define a new directory.
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| 12 |
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| 13 | ---> defs_platform.h:
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| 14 |
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| 15 | This file is mandatory. This file defines the
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| 16 | NB_PROCS per cluster, the NB_CLUSTERS and the base address of
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| 17 | the TTY, IOC and XICU devices.
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| 18 | It defines also:
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| 19 | -> CACHE_COHERENCE
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| 20 | This constant is used by the boot_ioc_read function to know
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| 21 | if the buffer used to store the blocks from the block_device
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| 22 | must be invalidated in the dcache after the transfert has
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| 23 | finished.
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| 24 | 0 means invalidation must be made.
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| 25 |
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| 26 | -> CACHE_LINE_SIZE
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| 27 | This constant defines the size in bytes of a cache line.
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| 28 |
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| 29 | -> IRQ_PER_PROC
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| 30 | This constant is used to know how many XICU irq outputs are
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| 31 | connected to each processor.
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| 32 |
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| 33 | ---> platform_soclib.dts:
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| 34 |
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| 35 | Device tree file. It is mandatory if compiling
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| 36 | for a SOCLIB platform. If the application to execute does not use
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| 37 | a device tree file, create an empty one.
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| 38 |
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| 39 | ---> platform_fpga.dts:
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| 40 | Device tree file. It is mandatory if compiling
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| 41 | for a FPGA platform. If the application to execute does not use
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| 42 | a device tree file, create an empty one.
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| 43 |
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| 44 | ---> ldscript:
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| 45 | LD script defining the segments of this boot loader.
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| 46 | We define two segments:
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| 47 | seg_stack_base: Base address of the stack used by processor 0
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| 48 | during the boot process.
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| 49 |
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| 50 | seg_boot_base: Base address of the code and data defined for
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| 51 | this loader
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| 52 |
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| 53 | Makefile Makefile for compile the boot loader.
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| 54 | Arguments to pass:
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| 55 |
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| 56 | ---> PLATFORM_DIR=conf/<platform_dir>
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| 57 |
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| 58 | Defines the directory where to find the plateform specific
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| 59 | files
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| 60 |
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| 61 | ---> SOCLIB=1
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| 62 |
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| 63 | If using SOCLIB, define this flag to use the SOCLIB device
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| 64 | drivers
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| 65 |
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| 66 | ---> SYSCLK_FREQ=<value hz>
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| 67 |
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| 68 | If not SOCLIB platform, this flag allows us to choose the
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| 69 | CLK frequency used in the hardware platform (i.e. FPGA).
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| 70 | This information is used to configurate the SPI device
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| 71 | which allow us to drive a SD card device.
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| 72 |
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| 73 | i.e. make PLATFORM_DIR=conf/<platform_dir> SYSCLK_FREQ=50000000
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| 74 | make PLATFORM_DIR=conf/<platform_dir> SOCLIB=1
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