| 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 examples. |
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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 | -> INSTRUMENTATION |
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| 27 | Set value different to 0 if some instrumentation of the |
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| 28 | bootloader is needed. |
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| 29 | |
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| 30 | -> CACHE_LINE_SIZE |
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| 31 | This constant defines the size in bytes of a cache line. |
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| 32 | |
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| 33 | -> IRQ_PER_PROC |
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| 34 | This constant is used to know how many XICU irq outputs are |
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| 35 | connected to each processor. |
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| 36 | |
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| 37 | ---> platform_soclib.dts: |
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| 38 | |
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| 39 | Device tree file. It is mandatory if compiling |
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| 40 | for a SOCLIB platform. If the application to execute does not use |
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| 41 | a device tree file, create an empty one. |
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| 42 | |
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| 43 | ---> platform_fpga.dts: |
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| 44 | |
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| 45 | Device tree file. It is mandatory if compiling |
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| 46 | for a FPGA platform. If the application to execute does not use |
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| 47 | a device tree file, create an empty one. |
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| 48 | |
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| 49 | ---> ldscript: |
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| 50 | |
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| 51 | LD script defining the segments of this boot loader. |
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| 52 | We define two segments: |
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| 53 | seg_stack_base: Base address of the stack used by processor 0 |
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| 54 | during the boot process. |
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| 55 | |
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| 56 | seg_boot_base: Base address of the code and data defined for |
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| 57 | this loader |
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| 58 | |
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| 59 | Makefile Makefile for compile the boot loader. |
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| 60 | Arguments to pass: |
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| 61 | |
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| 62 | ---> PLATFORM_DIR=<platform_dir> |
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| 63 | |
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| 64 | Defines the directory where to find the plateform specific |
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| 65 | files |
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| 66 | |
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| 67 | ---> SOCLIB=1 |
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| 68 | |
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| 69 | If using SOCLIB, define this flag to use the SOCLIB device |
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| 70 | drivers |
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| 71 | |
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| 72 | ---> SYSCLK_FREQ=<value hz> |
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| 73 | |
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| 74 | If not SOCLIB platform, this flag allows us to choose the |
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| 75 | CLK frequency used in the hardware platform (i.e. FPGA). |
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| 76 | This information is used to configurate the SPI device |
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| 77 | which allow us to drive a SD card device. |
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| 78 | |
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| 79 | i.e. make PLATFORM_DIR=conf/<platform_dir> SYSCLK_FREQ=50000000 |
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| 80 | make PLATFORM_DIR=conf/<platform_dir> SOCLIB=1 |
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