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authorMike Frysinger <vapier@gentoo.org>2009-04-24 23:39:41 -0400
committerMike Frysinger <vapier@gentoo.org>2009-05-06 08:47:21 -0400
commit02778f2f1b4b1a28b492367477db27c58d45ae35 (patch)
treef7f5b18e011460da48e86b93d808052e945c7433
parentaf2c37378f203857d5e6c957e77a14c2da5b59d2 (diff)
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Blackfin: fix booting with older bootroms (no EVT1)
When dropping jump block support, the assumption was that all bootroms supported entry point redirection via the EVT1 register. Unfortunately, this turned out to be incorrect for the oldest Blackfin parts (BF533-0.2 and older and BF561). No one really noticed earlier because these parts usually are booted by bypassing the bootrom entirely, and older BF533 parts are not supported at all (too many anomalies). Signed-off-by: Mike Frysinger <vapier@gentoo.org>
-rw-r--r--blackfin_config.mk6
-rw-r--r--board/bf561-ezkit/u-boot.lds.S9
-rw-r--r--cpu/blackfin/cpu.c10
-rw-r--r--cpu/blackfin/initcode.c2
-rw-r--r--include/asm-blackfin/blackfin-config-pre.h8
5 files changed, 32 insertions, 3 deletions
diff --git a/blackfin_config.mk b/blackfin_config.mk
index 04a7529..05077c8 100644
--- a/blackfin_config.mk
+++ b/blackfin_config.mk
@@ -36,7 +36,9 @@ endif
SYM_PREFIX = _
-LDR_FLAGS += -J
+LDR_FLAGS-y :=
+LDR_FLAGS-$(CONFIG_BFIN_BOOTROM_USES_EVT1) += -J
+
LDR_FLAGS += --bmode $(subst BFIN_BOOT_,,$(CONFIG_BFIN_BOOT_MODE))
LDR_FLAGS += --use-vmas
ifneq ($(CONFIG_BFIN_BOOT_MODE),BFIN_BOOT_BYPASS)
@@ -45,3 +47,5 @@ endif
ifneq (,$(findstring s,$(MAKEFLAGS)))
LDR_FLAGS += --quiet
endif
+
+LDR_FLAGS += $(LDR_FLAGS-y)
diff --git a/board/bf561-ezkit/u-boot.lds.S b/board/bf561-ezkit/u-boot.lds.S
index 4220e81..e6d3ddc 100644
--- a/board/bf561-ezkit/u-boot.lds.S
+++ b/board/bf561-ezkit/u-boot.lds.S
@@ -42,12 +42,19 @@
# define L1_DATA_B_SRAM_SIZE 0
#endif
+/* The 0xC offset is so we don't clobber the tiny LDR jump block. */
+#ifdef CONFIG_BFIN_BOOTROM_USES_EVT1
+# define L1_CODE_ORIGIN L1_INST_SRAM
+#else
+# define L1_CODE_ORIGIN L1_INST_SRAM + 0xC
+#endif
+
OUTPUT_ARCH(bfin)
MEMORY
{
ram : ORIGIN = CONFIG_SYS_MONITOR_BASE, LENGTH = CONFIG_SYS_MONITOR_LEN
- l1_code : ORIGIN = L1_INST_SRAM, LENGTH = L1_INST_SRAM_SIZE
+ l1_code : ORIGIN = L1_CODE_ORIGIN, LENGTH = L1_INST_SRAM_SIZE
l1_data : ORIGIN = L1_DATA_B_SRAM, LENGTH = L1_DATA_B_SRAM_SIZE
}
diff --git a/cpu/blackfin/cpu.c b/cpu/blackfin/cpu.c
index c2ff8cd..9bb6407 100644
--- a/cpu/blackfin/cpu.c
+++ b/cpu/blackfin/cpu.c
@@ -25,12 +25,20 @@ ulong bfin_poweron_retx;
__attribute__ ((__noreturn__))
void cpu_init_f(ulong bootflag, ulong loaded_from_ldr)
{
+ extern char _stext_l1;
+#ifndef CONFIG_BFIN_BOOTROM_USES_EVT1
+ /* Build a NOP slide over the LDR jump block. Whee! */
+ char nops[0xC];
+ serial_early_puts("NOP Slide\n");
+ memset(nops, 0x00, sizeof(nops));
+ memcpy(&_stext_l1 - sizeof(nops), nops, sizeof(nops));
+#endif
+
if (!loaded_from_ldr) {
/* Relocate sections into L1 if the LDR didn't do it -- don't
* check length because the linker script does the size
* checking at build time.
*/
- extern char _stext_l1;
serial_early_puts("L1 Relocate\n");
extern char _stext_l1, _etext_l1, _stext_l1_lma;
memcpy(&_stext_l1, &_stext_l1_lma, (&_etext_l1 - &_stext_l1));
diff --git a/cpu/blackfin/initcode.c b/cpu/blackfin/initcode.c
index c0fe2c6..a039cbb 100644
--- a/cpu/blackfin/initcode.c
+++ b/cpu/blackfin/initcode.c
@@ -543,9 +543,11 @@ void initcode(ADI_BOOT_DATA *bootstruct)
serial_putc('T');
+#ifdef CONFIG_BFIN_BOOTROM_USES_EVT1
/* tell the bootrom where our entry point is */
if (CONFIG_BFIN_BOOT_MODE != BFIN_BOOT_BYPASS)
bfin_write_EVT1(CONFIG_SYS_MONITOR_BASE);
+#endif
serial_putc('>');
serial_putc('\n');
diff --git a/include/asm-blackfin/blackfin-config-pre.h b/include/asm-blackfin/blackfin-config-pre.h
index e973de7..a3db362 100644
--- a/include/asm-blackfin/blackfin-config-pre.h
+++ b/include/asm-blackfin/blackfin-config-pre.h
@@ -54,6 +54,14 @@ static inline const char *get_bfin_boot_mode(int bfin_boot)
}
#endif
+/* Most bootroms allow for EVT1 redirection */
+#if (defined(__ADSPBF531__) || defined(__ADSPBF532__) || defined(__ADSPBF533__) \
+ && __SILICON_REVISION__ < 3) || defined(__ADSPBF561__)
+# undef CONFIG_BFIN_BOOTROM_USES_EVT1
+#else
+# define CONFIG_BFIN_BOOTROM_USES_EVT1
+#endif
+
/* Define the default SPI CS used when booting out of SPI */
#if defined(__ADSPBF531__) || defined(__ADSPBF532__) || defined(__ADSPBF533__) || \
defined(__ADSPBF538__) || defined(__ADSPBF539__) || defined(__ADSPBF561__) || \