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annotate gsm-fw/sysglue/flashboot.S @ 635:658a83ff7221

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gsm-fw/sysglue/flashboot.S: buglet in the previous change
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Mon, 01 Sep 2014 18:45:37 +0000
parents 1f54d2ba42c2
children 06ecb305f650
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631
7cf154cd3891 gsm-fw/sysglue: prep for building flashable images
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1 /*
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2 * This assembly module contains those bits which are specific to flashable
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3 * image builds only. It puts bits of code into several different sections.
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4 */
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5
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6 #include "../include/config.h"
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7
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8 .section flashboot.text,"ax",%progbits
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9 .code 32
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10 .org 0
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11 #if FLASH_BOOT_VIA_BOOTROM
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12 /* sane targets with Calypso boot ROM enabled by the PCB wiring */
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13 /* provide the necessary magic words for the boot ROM */
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14 .word 0
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15 .word _Flash_boot_entry
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16 #elif CONFIG_TARGET_C139
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17 /*
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18 * On this target we are going to put a special flash boot stage at 0x2000,
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19 * and then the actual gsm-fw image at the flash erase block boundary
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20 * at 0x10000. The following bits will be read by our intermediate
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21 * flash boot stage.
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22 */
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23 .asciz "FreeCalypso"
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24 .word _Flash_boot_entry
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25 #elif CONFIG_TARGET_C155
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26 /*
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27 * On this target the hand-off point between the bootloader and the main
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28 * fw image coincides with a flash erase block boundary, thus no need
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29 * for an intermediate flash boot stage. The following bits will appear
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30 * at 0x20000.
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31 */
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32 .asciz "FreeCalypso firmware for C155/156 target"
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33 .org 0xE0
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34 /* C155/156 bootloader jumps here */
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35 b _Flash_boot_entry
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36 #include "vectors.S"
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37 #else
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38 #error "Unsupported flash boot configuration"
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39 #endif
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40
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41 .globl _Flash_boot_entry
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42 _Flash_boot_entry:
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43 /* first order of business: configure flash and XRAM access */
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44 ldr r2, =0xFFFFFB00
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45 #if CONFIG_TARGET_PIRELLI
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46 mov r0, #0x00A4
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47 strh r0, [r2, #0]
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48 strh r0, [r2, #2]
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49 strh r0, [r2, #6]
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50 #else
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51 mov r0, #0x00A3
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52 strh r0, [r2, #0]
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53 strh r0, [r2, #2]
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54 #endif
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55 /*
634
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56 * On targets with 8 MiB flash (or XRAM) banks we need to switch the
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57 * CS4/ADD22 pin to the ADD22 function. We could do it for all targets
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58 * (not aware of any that need the pin to be CS4), but we strongly
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59 * prefer to have a consistent execution environment between flashImage
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60 * and ramImage, so let's only do this setting on those targets
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61 * on which we do it in ../../loadtools/scripts/*.init (for fc-xram).
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62 */
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63 #if CONFIG_TARGET_PIRELLI || CONFIG_TARGET_C155
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64 ldr r1, =0xFFFEF006
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65 mov r2, #0x0008
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66 strh r2, [r1]
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67 #endif
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68 /* we now have full access to all flash and RAM on the device */
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69 /* copy iram.text to where it's supposed to be */
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70 ldr r8, =__iramtext_flash_addr
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71 ldr r9, =__iramtext_ram_addr
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72 ldr r10, =__iramtext_size
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73 1: ldmia r8!, {r0-r7}
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74 stmia r9!, {r0-r7}
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75 subs r10, r10, #0x20
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76 bhi 1b
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77 /* likewise copy .data from flash to XRAM */
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78 ldr r8, =__initdata_flash_addr
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79 ldr r9, =__initdata_ram_addr
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80 ldr r10, =__initdata_size
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81 1: ldmia r8!, {r0-r7}
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82 stmia r9!, {r0-r7}
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83 subs r10, r10, #0x20
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84 bhi 1b
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85 /* boot path joins with fc-xram loadable builds */
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86 b _FlashorXram_entry