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New bootrom

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+ Add common area at end of RAM to communicate between main os and bootrom
+ Lower stack end to make room for common area
+ Implement CMD_DEVICE_INFO in both OS and bootrom to give information about the current state and supported features
+ Allow hands-free firmware update: When CMD_START_FLASH is received over USB in OS mode, the device will reset and enter the bootrom
  Pressing the button in hands-free update mode takes precedence: releasing the button will immediately abort firmware update and 
  perform a reset. Do not press the button.
+ Require each flash sequence to be preceded by a CMD_START_FLASH to set up the boundaries for the following flash sequence
  Not compatible with linux flasher before SVN revision 200
  Currently no compatible flasher for Windows. WINDOWS USERS: DO NOT UPDATE YOUR BOOTROM YET
+ Protect bootrom flash area unless magic unlock sequence is given in CMD_START_FLASH
This commit is contained in:
henryk@ploetzli.ch 2009-09-01 14:44:38 +00:00
commit 8fcbf652da
8 changed files with 202 additions and 49 deletions
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13
common/Makefile.common
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@ -39,10 +39,11 @@ DETECTED_OS=Windows
endif
CC = arm-elf-gcc
AS = arm-elf-as
LD = arm-elf-ld
OBJCOPY = arm-elf-objcopy
CROSS = arm-elf-
CC = $(CROSS)gcc
AS = $(CROSS)as
LD = $(CROSS)ld
OBJCOPY = $(CROSS)objcopy
OBJDIR = obj
@ -78,8 +79,8 @@ $(VERSIONOBJ): $(OBJDIR)/%.o: %.c $(INCLUDES)
$(OBJDIR)/%.s19: $(OBJDIR)/%.elf
$(OBJCOPY) -Osrec --srec-forceS3 --strip-debug --no-change-warnings \
--change-addresses -0x100000 --change-start 0 \
--change-section-address .bss+0 \
--change-section-address .data+0 $^ $@
--change-section-address .bss+0 --change-section-address .data+0 \
--change-section-address .commonarea+0 $^ $@
# version.c should be remade on every compilation
.PHONY: version.c

5
common/ldscript.common
View file

@ -11,12 +11,15 @@ MEMORY
bootphase2 : ORIGIN = 0x00100200, LENGTH = 0x2000 - 0x200 /* Main bootloader code, stored in Flash, executed from RAM */
fpgaimage : ORIGIN = 0x00102000, LENGTH = 64k - 0x2000 /* Place where the FPGA image will end up */
osimage : ORIGIN = 0x00110000, LENGTH = 256K - 64k /* Place where the main OS will end up */
ram : ORIGIN = 0x00200000, LENGTH = 64K
ram : ORIGIN = 0x00200000, LENGTH = 64K - 0x20 /* RAM, minus small common area */
commonarea : ORIGIN = 0x00200000 + 64K - 0x20, LENGTH = 0x20 /* Communication between bootloader and main OS */
}
/* Export some information that can be used from within the firmware */
_bootphase1_version_pointer = ORIGIN(bootphase1) + LENGTH(bootphase1) - 0x4;
_osimage_entry = ORIGIN(osimage);
_bootrom_start = ORIGIN(bootphase1);
_bootrom_end = ORIGIN(bootphase2) + LENGTH(bootphase2);
_flash_start = ORIGIN(bootphase1);
_flash_end = ORIGIN(osimage) + LENGTH(osimage);
_stack_end = ORIGIN(ram) + LENGTH(ram) - 8;