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URL https://opencores.org/ocsvn/neorv32/neorv32/trunk

Subversion Repositories neorv32

Compare Revisions

  • This comparison shows the changes necessary to convert path 
    /neorv32/trunk/sw/bootloader
    from Rev 43 to Rev 47
    ↔ Reverse comparison
  •

Rev 43 → Rev 47

/bootloader.c
153,9 → 153,15
* This global variable keeps the size of the available executable in bytes.
* If =0 no executable is available (yet).
**************************************************************************/
uint32_t exe_available = 0;
volatile uint32_t exe_available = 0;
 
 
/**********************************************************************//**
* Only set during executable fetch (required for cpaturing STORE-BUS-TIMOUT exception).
**************************************************************************/
volatile uint32_t getting_exe = 0;
 
 
// Function prototypes
void __attribute__((__interrupt__)) bootloader_trap_handler(void);
void fast_upload(int src);
187,19 → 193,10
#warning In order to allow the bootloader to run on any CPU configuration it should be compiled using the base ISA (rv32i/e) only.
#endif
 
// global variable for executable size; 0 means there is no exe available
exe_available = 0;
exe_available = 0; // global variable for executable size; 0 means there is no exe available
getting_exe = 0; // we are not trying to get an executable yet
 
// ------------------------------------------------
// Minimal CPU hardware initialization
// - all IO devices are reset and disabled by the crt0 code
// ------------------------------------------------
 
// confiure trap handler (bare-metal, no neorv32 rte available)
neorv32_cpu_csr_write(CSR_MTVEC, (uint32_t)(&bootloader_trap_handler));
 
 
// ------------------------------------------------
// Minimal processor hardware initialization
// - all IO devices are reset and disabled by the crt0 code
// ------------------------------------------------
226,6 → 223,10
// Configure machine system timer interrupt for ~2Hz
neorv32_mtime_set_timecmp(neorv32_mtime_get_time() + (clock_speed/4));
 
// confiure trap handler (bare-metal, no neorv32 rte available)
neorv32_cpu_csr_write(CSR_MTVEC, (uint32_t)(&bootloader_trap_handler));
 
// active timer IRQ
neorv32_cpu_csr_write(CSR_MIE, 1 << CSR_MIE_MTIE); // activate MTIME IRQ source
neorv32_cpu_eint(); // enable global interrupts
 
405,12 → 406,13
 
/**********************************************************************//**
* Bootloader trap handler. Used for the MTIME tick and to capture any other traps.
* @warning Since we have no runtime environment, we have to use the interrupt attribute here. Here, and only here!
* @warning Since we have no runtime environment, we have to use the interrupt attribute here. Here and only here!
**************************************************************************/
void __attribute__((__interrupt__)) bootloader_trap_handler(void) {
 
uint32_t cause = neorv32_cpu_csr_read(CSR_MCAUSE);
 
// make sure this was caused by MTIME IRQ
uint32_t cause = neorv32_cpu_csr_read(CSR_MCAUSE);
if (cause == TRAP_CODE_MTI) { // raw exception code for MTI
if (STATUS_LED_EN == 1) {
// toggle status LED
419,17 → 421,20
// set time for next IRQ
neorv32_mtime_set_timecmp(neorv32_mtime_get_time() + (SYSINFO_CLK/4));
}
 
else if (cause == TRAP_CODE_S_ACCESS) { // seems like executable is too large
system_error(ERROR_SIZE);
}
 
else {
neorv32_uart_print("\n\nEXC (");
print_hex_word(cause);
neorv32_uart_print(") @ 0x");
print_hex_word(neorv32_cpu_csr_read(CSR_MEPC));
system_error(ERROR_SYSTEM);
// store bus access error during get_exe
// -> seems like executable is too large
if ((cause == TRAP_CODE_S_ACCESS) && (getting_exe)) {
system_error(ERROR_SIZE);
}
// unknown error
else {
neorv32_uart_print("\n\nEXC (");
print_hex_word(cause);
neorv32_uart_print(") @ 0x");
print_hex_word(neorv32_cpu_csr_read(CSR_MEPC));
system_error(ERROR_SYSTEM);
}
}
}
 
441,6 → 446,8
**************************************************************************/
void get_exe(int src) {
 
getting_exe = 1; // to inform trap handler we were trying to get an executable
 
// is MEM implemented and read-only?
if ((SYSINFO_FEATURES & (1 << SYSINFO_FEATURES_MEM_INT_IMEM_ROM)) &&
(SYSINFO_FEATURES & (1 << SYSINFO_FEATURES_MEM_INT_IMEM))) {
493,6 → 500,8
neorv32_uart_print("OK");
exe_available = size; // store exe size
}
 
getting_exe = 0; // to inform trap handler we are done getting an executable
}
 
 

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