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