WIP Add cmd to adjust kermit buffer location

also delay boot at kermit transfer by ~1s to allow the program to resume listening to the console

litex/soc/software/bios/boot.c

@@ -48,6 +48,10 @@
 
 extern void boot_helper(unsigned long r1, unsigned long r2, unsigned long r3, unsigned long addr);
 
+static inline void mtkasr(uint64_t val)
+{
+    asm volatile("mtspr 850, %0;" : : "r" (val));
+}
 void __attribute__((noreturn)) boot(unsigned long r1, unsigned long r2, unsigned long r3, unsigned long addr)
 {
 	printf("Executing booted program at 0x%08x\n\n", addr);
@@ -71,6 +75,17 @@ void __attribute__((noreturn)) boot(unsigned long r1, unsigned long r2, unsigned
 	addr += 0x100;
 #endif
 
+    {
+        /*  delay boot for 1s (or more)*/
+        int i = CONFIG_CLOCK_FREQUENCY/2;
+        while(i) {
+            __asm__ volatile("nop");
+            i--;
+        }
+    }
+
+    /* remap the interrupt vector... I hope */
+    mtkasr(1);
 	boot_helper(r1, r2, r3, addr);
 	while(1);
 }

litex/soc/software/bios/kermit-client.c

@@ -6,6 +6,8 @@
 #include <console.h>
 
 #include <stdio.h>
+
+#include "command.h"
 /*
  * This is a debugging tool for detecting when the kermit
  * code is returning to the caller instead of continuing the transfer
@@ -297,6 +299,24 @@ whole_pkt_start:
             return sm->return_status;
     }
 }
+uint8_t *kermit_output_base = 
+    (uint8_t*)(MAIN_RAM_BASE + (MAIN_RAM_SIZE/2));
+
+static void kermbase(int nb_params, char **params)
+{
+    size_t tmp = 0;
+    char *c;
+    if (nb_params < 1)
+    {
+        printf("kermbase <baseaddr>\n"
+               "currently: %p\n", kermit_output_base);
+        return;
+    }
+    tmp = strtoul(params[0], &c, 0);
+    kermit_output_base = (uint8_t*)tmp;
+    return;
+}
+define_command(kermbase, kermbase, "Set kermit load base addressi", SYSTEM_CMDS);
 
 #define KERM_MAGIC 0x47921306
 static inline struct mini_kerm_sm* init_kermit_sm(void)
@@ -324,7 +344,8 @@ static inline struct mini_kerm_sm* init_kermit_sm(void)
 #endif
     sm->pkt_buffer_size = buffer_size;
     sm->pkt_buffer = (uint8_t*)(sm + 1);
-    sm->outbuffer_base = (uint8_t*)(MAIN_RAM_BASE + (MAIN_RAM_SIZE/2));
+    //sm->outbuffer_base = (uint8_t*)(MAIN_RAM_BASE + (MAIN_RAM_SIZE/2));
+    sm->outbuffer_base = kermit_output_base;
     sm->outbuffer = sm->outbuffer_base;
     sm->done = false;
     return sm;
@@ -341,20 +362,6 @@ bool kermit_valid_packet(uint8_t *buffer, size_t len)
     return true;
 }
 
-#if 0
-//int run_kermit(void)
-int run_kermit(uint8_t *buffer, size_t len)
-{
-    struct mini_kerm_sm *sm = init_kermit_sm();
-    size_t l_len = buffer ? 0 : getpacket_length(buffer) + 2;
-    if (!buffer)
-        buffer = sm->pkt_buffer;
-
-    //memcpy(sm->pkt_buffer, buffer, getpacket_length(buffer) + 2);
-    return kermit_get_file(sm, buffer, l_len);
-}
-#endif
-
 void __attribute__((noreturn)) boot(unsigned long r1, unsigned long r2,
         unsigned long r3, unsigned long addr);
 int kermit_maybe(uint8_t mark)
@@ -362,7 +369,7 @@ int kermit_maybe(uint8_t mark)
     if (mark != 1)
         return -1;
     struct mini_kerm_sm *sm = init_kermit_sm();
-    printf("Placing output buffer @0x%p\n", sm->outbuffer_base);
+    //printf("Placing output buffer @0x%p\n", sm->outbuffer_base);
     /* boot should'nt return */
     if (!kermit_get_file(sm, mark))
         boot(0, 0, 0, sm->outbuffer_base);