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-rw-r--r--src/stm/altos-application.ld72
-rw-r--r--src/stm/altos-loader.ld72
-rw-r--r--src/stm/ao_boot.h24
-rw-r--r--src/stm/ao_interrupt.c44
4 files changed, 202 insertions, 10 deletions
diff --git a/src/stm/altos-application.ld b/src/stm/altos-application.ld
new file mode 100644
index 00000000..63a3be00
--- /dev/null
+++ b/src/stm/altos-application.ld
@@ -0,0 +1,72 @@
+/*
+ * Copyright © 2012 Keith Packard <keithp@keithp.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+MEMORY {
+ rom (rx) : ORIGIN = 0x08002000, LENGTH = 120K
+ ram (!w) : ORIGIN = 0x20000000, LENGTH = 16K
+}
+
+INCLUDE registers.ld
+
+EXTERN (stm_interrupt_vector)
+
+SECTIONS {
+ /*
+ * Rom contents
+ */
+
+ .text ORIGIN(rom) : {
+ __text_start__ = .;
+ *(.interrupt) /* Interrupt vectors */
+
+ . = ORIGIN(rom) + 0x100;
+
+ ao_romconfig.o(.romconfig*)
+ ao_product.o(.romconfig*)
+
+ *(.text*) /* Executable code */
+ *(.rodata*) /* Constants */
+
+ } > rom
+
+ .ARM.exidx : {
+ *(.ARM.exidx* .gnu.linkonce.armexidx.*)
+ __text_end__ = .;
+ } > rom
+
+ /* Data -- relocated to RAM, but written to ROM
+ */
+ .data ORIGIN(ram) : AT (ADDR(.ARM.exidx) + SIZEOF (.ARM.exidx)) {
+ __data_start__ = .;
+ *(.data) /* initialized data */
+ __data_end__ = .;
+ __bss_start__ = .;
+ } >ram
+
+ .bss : {
+ *(.bss)
+ *(COMMON)
+ __bss_end__ = .;
+ } >ram
+
+ PROVIDE(__stack__ = ORIGIN(ram) + LENGTH(ram));
+ PROVIDE(end = .);
+}
+
+ENTRY(start);
+
+
diff --git a/src/stm/altos-loader.ld b/src/stm/altos-loader.ld
new file mode 100644
index 00000000..2d71b4ee
--- /dev/null
+++ b/src/stm/altos-loader.ld
@@ -0,0 +1,72 @@
+/*
+ * Copyright © 2012 Keith Packard <keithp@keithp.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+MEMORY {
+ rom (rx) : ORIGIN = 0x08000000, LENGTH = 8K
+ ram (!w) : ORIGIN = 0x20000000, LENGTH = 16K
+}
+
+INCLUDE registers.ld
+
+EXTERN (stm_interrupt_vector)
+
+SECTIONS {
+ /*
+ * Rom contents
+ */
+
+ .text ORIGIN(rom) : {
+ __text_start__ = .;
+ *(.interrupt) /* Interrupt vectors */
+
+ . = ORIGIN(rom) + 0x100;
+
+ ao_romconfig.o(.romconfig*)
+ ao_product.o(.romconfig*)
+
+ *(.text*) /* Executable code */
+ *(.rodata*) /* Constants */
+
+ } > rom
+
+ .ARM.exidx : {
+ *(.ARM.exidx* .gnu.linkonce.armexidx.*)
+ __text_end__ = .;
+ } > rom
+
+ /* Data -- relocated to RAM, but written to ROM
+ */
+ .data ORIGIN(ram) : AT (ADDR(.ARM.exidx) + SIZEOF (.ARM.exidx)) {
+ __data_start__ = .;
+ *(.data) /* initialized data */
+ __data_end__ = .;
+ __bss_start__ = .;
+ } >ram
+
+ .bss : {
+ *(.bss)
+ *(COMMON)
+ __bss_end__ = .;
+ } >ram
+
+ PROVIDE(__stack__ = ORIGIN(ram) + LENGTH(ram));
+ PROVIDE(end = .);
+}
+
+ENTRY(start);
+
+
diff --git a/src/stm/ao_boot.h b/src/stm/ao_boot.h
new file mode 100644
index 00000000..863d8e05
--- /dev/null
+++ b/src/stm/ao_boot.h
@@ -0,0 +1,24 @@
+/*
+ * Copyright © 2013 Keith Packard <keithp@keithp.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+#ifndef _AO_BOOT_H_
+#define _AO_BOOT_H_
+
+void
+ao_reboot_application(void);
+
+#endif /* _AO_BOOT_H_ */
diff --git a/src/stm/ao_interrupt.c b/src/stm/ao_interrupt.c
index 12763a30..9e756219 100644
--- a/src/stm/ao_interrupt.c
+++ b/src/stm/ao_interrupt.c
@@ -42,12 +42,45 @@ const void *stm_interrupt_vector[];
#ifdef AO_BOOT_APPLICATION_PIN
#include <ao_exti.h>
+
+#define AO_BOOT_APPLICATION 0x5a5aa5a5
+#define AO_BOOT_APPLICATION_CHECK 0xc3c33c3c
+
+static uint32_t ao_boot_application;
+static uint32_t ao_boot_application_check;
+
+static void
+ao_boot_chain(void) {
+ uint32_t sp;
+ uint32_t pc;
+
+ sp = BOOT_FETCH(0);
+ pc = BOOT_FETCH(4);
+ asm ("mov sp, %0" : : "r" (sp));
+ asm ("mov lr, %0" : : "r" (pc));
+ asm ("bx lr");
+}
+
+void
+ao_reboot_application(void)
+{
+ ao_boot_application = AO_BOOT_APPLICATION;
+ ao_boot_application_check = AO_BOOT_APPLICATION_CHECK;
+ ao_arch_reboot();
+}
+
#endif
void start(void) {
#ifdef AO_BOOT_APPLICATION_PIN
uint16_t v;
+ if (ao_boot_application == AO_BOOT_APPLICATION &&
+ ao_boot_application_check == AO_BOOT_APPLICATION_CHECK) {
+ ao_boot_application = 0;
+ ao_boot_application_check = 0;
+ ao_boot_chain();
+ }
/* Enable power interface clock */
stm_rcc.apb1enr |= (1 << STM_RCC_APB1ENR_PWREN);
@@ -63,16 +96,7 @@ void start(void) {
ao_disable_port(&AO_BOOT_APPLICATION_GPIO);
stm_rcc.apb1enr &= ~(1 << STM_RCC_APB1ENR_PWREN);
if (v == AO_BOOT_APPLICATION_VALUE)
- {
- uint32_t sp;
- uint32_t pc;
-
- sp = BOOT_FETCH(0);
- pc = BOOT_FETCH(4);
- asm ("mov sp, %0" : : "r" (sp));
- asm ("mov lr, %0" : : "r" (pc));
- asm ("bx lr");
- }
+ ao_boot_chain();
#endif
/* Set interrupt vector table offset */
generated by cgit v1.2.3 (git 2.39.1) at 2025-10-17 12:40:58 +0000