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F421: work around bug in old bootloader #68

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merged 1 commit into from
Sep 12, 2024
Merged

F421: work around bug in old bootloader #68

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14 changes: 11 additions & 3 deletions Mcu/f421/AT32F421x6_FLASH.ld
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Original file line number Diff line number Diff line change
Expand Up @@ -20,8 +20,16 @@
/* Entry Point */
ENTRY(Reset_Handler)

/* Highest address of the user mode stack */
_estack = 0x20004000; /* end of RAM */
/*
Highest address of the user mode stack

we set this less than the 16k available due to a bug in the old
bootloader for F421. The old bootloader writes to the stack pointer
after setting up the stack based on the app header. This means if we
set the app stack right at the end of memory then the bootloader
hard faults.
*/
_estack = 0x20003c00;

/* Generate a link error if heap and stack don't fit into RAM */
_Min_Heap_Size = 0x200; /* required amount of heap */
Expand All @@ -34,7 +42,7 @@ FLASH (rx) : ORIGIN = 0x08001000, LENGTH = 27K
FLASH_VERSION (rx) : ORIGIN = 0x08007C00 - 48, LENGTH = 16
FILE_NAME (rx) : ORIGIN = 0x08007C00 - 32, LENGTH = 32
EEPROM (rx) : ORIGIN = 0x08007C00, LENGTH = 1K
RAM (xrw) : ORIGIN = 0x20000000, LENGTH = 16K
RAM (xrw) : ORIGIN = 0x20000000, LENGTH = 15K

}

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