rfdsatt: switch from STM32F103C8 to STM32F103C6

The C8 variant (64k Flash / 20k RAM) is not to be sourced anywhere
on the planet right now, so we went to a 32k Flash / 10k RAM
STM32F103C6.

Target/Demo/ARMCM3_STM32F1_sysmocom_rfdsatt_GCC/Boot/STM32F103RB_FLASH.ld

@@ -4,8 +4,8 @@
 
 **  File        : stm32_flash.ld
 **
-**  Abstract    : Linker script for STM32F103RB Device with
-**                128KByte FLASH, 20KByte RAM
+**  Abstract    : Linker script for STM32F103C6 Device with
+**                328KByte FLASH, 10KByte RAM
 **
 **                Set heap size, stack size and stack location according
 **                to application requirements.
@@ -32,7 +32,7 @@
 ENTRY(Reset_Handler)
 
 /* Highest address of the user mode stack */
-_estack = 0x20005000;    /* end of RAM */
+_estack = 0x20002800;    /* end of RAM */
 /* Generate a link error if heap and stack don't fit into RAM */
 _Min_Heap_Size = 0x200;      /* required amount of heap  */
 _Min_Stack_Size = 0x400; /* required amount of stack */
@@ -40,8 +40,8 @@ _Min_Stack_Size = 0x400; /* required amount of stack */
 /* Specify the memory areas */
 MEMORY
 {
-RAM (xrw)      : ORIGIN = 0x20000000, LENGTH = 20K
-FLASH (rx)      : ORIGIN = 0x8000000, LENGTH = 24K
+RAM (xrw)      : ORIGIN = 0x20000000, LENGTH = 10K
+FLASH (rx)      : ORIGIN = 0x8000000, LENGTH = 32K
 }
 
 /* Define output sections */

Target/Demo/ARMCM3_STM32F1_sysmocom_rfdsatt_GCC/Boot/blt_conf.h

@@ -169,7 +169,7 @@
 /** \brief Enable/disable the NVM hook function for supporting additional memory devices. */
 #define BOOT_NVM_HOOKS_ENABLE           (0)
 /** \brief Configure the size of the default memory device (typically flash EEPROM). */
-#define BOOT_NVM_SIZE_KB                (128)
+#define BOOT_NVM_SIZE_KB                (32)
 /** \brief Enable/disable hooks functions to override the user program checksum handling. */
 #define BOOT_NVM_CHECKSUM_HOOKS_ENABLE  (0)
 

Target/Demo/ARMCM3_STM32F1_sysmocom_rfdsatt_GCC/Boot/makefile

@@ -104,7 +104,7 @@ STDFLAGS    = -mcpu=cortex-m3 -mthumb -std=gnu11 -fstack-usage -Wall -specs=nano
 STDFLAGS   += -fdata-sections -ffunction-sections -Wall -g -Wno-strict-aliasing
 OPTFLAGS    = -O2
 CFLAGS      = $(STDFLAGS) $(OPTFLAGS)
-CFLAGS     += -DUSE_FULL_LL_DRIVER -DUSE_HAL_DRIVER -DSTM32F103xB
+CFLAGS     += -DUSE_FULL_LL_DRIVER -DUSE_HAL_DRIVER -DSTM32F103x6
 CFLAGS     += -D__weak="__attribute__((weak))" -D__packed="__attribute__((__packed__))"
 CFLAGS     += $(INC_PATH)
 AFLAGS      = $(CFLAGS)