Use correct frequency for the sd-spi interface

bootrom/sdboot/head.S

@@ -8,7 +8,7 @@
   .globl _prog_start
 _prog_start:
   smp_pause(s1, s2)
-  li sp, (PAYLOAD_DEST + 0xffff000)
+  li sp, (PAYLOAD_DEST + 0x7fff000)
   call main
   smp_resume(s1, s2)
   csrr a0, mhartid

bootrom/sdboot/kprintf.h

@@ -20,8 +20,7 @@ static volatile uint32_t * const uart = (void *)(UART_CTRL_ADDR);
 
 static inline void kputc(char c)
 {
-	//volatile uint32_t *tx = &REG32(uart, UART_REG_TXFIFO);
-	volatile uint32_t *tx = (void *) 0x64003000; // Terminal (32 bit)
+	volatile uint32_t *tx = &REG32(uart, UART_REG_TXFIFO);
 #ifdef __riscv_atomic
 	int32_t r;
 	do {
@@ -34,6 +33,9 @@ static inline void kputc(char c)
 	while ((int32_t)(*tx) < 0);
 	*tx = c;
 #endif
+	volatile uint32_t *term = (void *) 0x64003000; // Terminal (32 bit)
+	while ((int32_t)(*term) < 0);
+	*term = c;
 }
 
 extern void kputs(const char *);

bootrom/sdboot/sd.c

@@ -160,8 +160,7 @@ static int copy(void)
 	int rc = 0;
 
 	dputs("CMD18");
-	//~ kprintf("LOADING  ");
-	kprintf("READ: ");
+	kprintf("LOADING  ");
 
 	REG32(spi, SPI_REG_SCKDIV) = (F_CLK / 20000000UL);
 	if (sd_cmd(0x52, 0, 0xE1) != 0x00) {
@@ -173,18 +172,14 @@ static int copy(void)
 		long n;
 
 		crc = 0;
-		//~ n = 512;
-		n = 50;
+		n = 512;
 		while (sd_dummy() != 0xFE);
 		do {
 			uint8_t x = sd_dummy();
-			kputc(x);
-			//~ *p++ = x;
-			//~ crc = crc16_round(crc, x);
+			*p++ = x;
+			crc = crc16_round(crc, x);
 		} while (--n > 0);
 
-		return 0;
-
 		crc_exp = ((uint16_t)sd_dummy() << 8);
 		crc_exp |= sd_dummy();
 
@@ -207,60 +202,10 @@ static int copy(void)
 	return rc;
 }
 
-// leave room for 2 MiB stack (SP = 8FFFF000)
-#define RAMTEST_START (uint32_t*)(0x80000000)
-#define RAMTEST_END   (uint32_t*)(0x8FDFF000)
-
 int main(void)
 {
-	//REG32(uart, UART_REG_TXCTRL) = UART_TXEN;
+	REG32(uart, UART_REG_TXCTRL) = UART_TXEN;
 
-	//GPIO_REG(GPIO_INPUT_EN) = 0xFF;
-	GPIO_REG(GPIO_OUTPUT_EN) = 0xFF;
-	GPIO_REG(GPIO_OUTPUT_VAL) = 0xFF;
-
-	kprintf("\nFilling RAM from %lx to %lx...\n", RAMTEST_START, RAMTEST_END);
-
-	uint32_t counter = 0;
-	for(uint32_t* ram = RAMTEST_START; ram < RAMTEST_END; ++ram) {
-		*ram = counter++;
-	}
-
-	kprintf("\rChecking RAM...\n");
-
-	counter = 0;
-	uint32_t correct = 0;
-	uint32_t wrong = 0;
-	for(uint32_t* ram = RAMTEST_START; ram < RAMTEST_END; ++ram) {
-		if(*ram != counter) {
-			kprintf("\rMismatch at %lx: read %x, expected %x\n", ram, *ram, counter);
-			++wrong;
-		} else {
-			++correct;
-		}
-		++counter;
-	}
-	kprintf("\rSummary: %x matches, %x mismatches.\n", correct, wrong);
-
-	kprintf("\nTrying to read from SD card...\n");
-
-	kputs("POWERON");
-	sd_poweron();
-	kprintf("sd_cmd0: %hx\n", sd_cmd0());
-	kprintf("sd_cmd8: %hx\n", sd_cmd8());
-	kprintf("sd_acmd41: %hx\n", sd_acmd41());
-	kprintf("sd_cmd58: %hx\n", sd_cmd58());
-	kprintf("sd_cmd16: %hx\n", sd_cmd16());
-	kprintf("\ncopy: %hx\n", copy());
-
-	while(1) {
-		//uint8_t dip_value = GPIO_REG(GPIO_INPUT_VAL) & 0b01111111;
-		//kprintf("dip value: %hx, ram value: %c\n", dip_value, ram[dip_value]);
-
-		GPIO_REG(GPIO_OUTPUT_VAL) ^= 0xFF;
-	}
-	return 0;
-/*
 	kputs("INIT");
 	sd_poweron();
 	if (sd_cmd0() ||
@@ -276,5 +221,5 @@ int main(void)
 	kputs("BOOT");
 
 	__asm__ __volatile__ ("fence.i" : : : "memory");
-	return 0;*/
+	return 0;
 }

src/main/scala/unleashed/u500ml507devkit/Config.scala

@@ -21,7 +21,7 @@ class FreedomUML507Config extends Config(
   new WithoutTLMonitors      ++
   new WithJtagDTM            ++
   new WithNMemoryChannels(1) ++
-  new WithNBigCores(1)       ++
+  new WithNSmallLinuxCores(1)       ++
   new BaseConfig
 )