ppc4xx: Add Canyonlands NAND booting support

460EX doesn't support a fixed bootstrap option to boot from 512 byte page
NAND devices. The only bootstrap option for NAND booting is option F for
2k page devices. So to boot from a 512 bype page device, the I2C bootstrap
EEPROM needs to be programmed accordingly.

This patch adds basic NAND booting support for the AMCC Canyonlands aval
board and also adds support to the "bootstrap" command, to enable NAND
booting I2C setting.

Tested with 512 byte page NAND device (32MByte) on Canyonlands.

Signed-off-by: Stefan Roese <sr@denx.de>

5 files changed, 179 insertions, 17 deletions

diff --git a/board/amcc/canyonlands/Makefile b/board/amcc/canyonlands/Makefile
index 02281ae..7a2eaa5 100644
--- a/board/amcc/canyonlands/Makefile
+++ b/board/amcc/canyonlands/Makefile
@@ -34,7 +34,7 @@ OBJS	:= $(addprefix $(obj),$(COBJS))
 SOBJS	:= $(addprefix $(obj),$(SOBJS))
 
 $(LIB):	$(OBJS) $(SOBJS)
-	$(AR) $(ARFLAGS) $@ $(OBJS)
+	$(AR) $(ARFLAGS) $@ $(OBJS) $(SOBJS)
 
 clean:
 	rm -f $(SOBJS) $(OBJS)
diff --git a/board/amcc/canyonlands/bootstrap.c b/board/amcc/canyonlands/bootstrap.c
index 3f5822e..37fa1c9 100644
--- a/board/amcc/canyonlands/bootstrap.c
+++ b/board/amcc/canyonlands/bootstrap.c
@@ -28,7 +28,7 @@
 #include <asm/io.h>
 
 /*
- * NOR and NAND boot options change bytes 6, 7, 8, 9, 11. The
+ * NOR and NAND boot options change bytes 5, 6, 8, 9, 11. The
  * values are independent of the rest of the clock settings.
  */
 
@@ -45,14 +45,14 @@ static char *config_labels[] = {
 
 static u8 boot_configs[][17] = {
 	{
-		(NOR_COMPATIBLE),
+		(NAND_COMPATIBLE | NOR_COMPATIBLE),
 		0x86, 0x80, 0xce, 0x1f, 0x79, 0x80, 0x00, 0xa0, 0x40, 0x08,
-		0x23, 0x50, 0x0d, 0x95, 0x00, 0x00
+		0x23, 0x50, 0x0d, 0x05, 0x00, 0x00
 	},
 	{
-		(NOR_COMPATIBLE),
+		(NAND_COMPATIBLE | NOR_COMPATIBLE),
 		0x86, 0x80, 0xba, 0x14, 0x99, 0x80, 0x00, 0xa0, 0x40, 0x08,
-		0x23, 0x50, 0x0d, 0x95, 0x00, 0x00
+		0x23, 0x50, 0x0d, 0x05, 0x00, 0x00
 	},
 	{
 		0,
@@ -61,10 +61,10 @@ static u8 boot_configs[][17] = {
 };
 
 /*
- * Bytes 6,8,9,11 change for NAND boot
+ * Bytes 5,6,8,9,11 change for NAND boot
  */
 static u8 nand_boot[] = {
-	0xd0,  0xa0, 0x68, 0x58
+	0x90, 0x01,  0xa0, 0x68, 0x58
 };
 
 static int do_bootstrap(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
@@ -146,10 +146,11 @@ static int do_bootstrap(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 	buf = &boot_configs[x][1];
 
 	if (b_nand) {
-		buf[6] = nand_boot[0];
-		buf[8] = nand_boot[1];
-		buf[9] = nand_boot[2];
-		buf[11] = nand_boot[3];
+		buf[5] = nand_boot[0];
+		buf[6] = nand_boot[1];
+		buf[8] = nand_boot[2];
+		buf[9] = nand_boot[3];
+		buf[11] = nand_boot[4];
 	}
 
 	if (i2c_write(I2C_EEPROM_ADDR, 0, 1, buf, 16) != 0)
diff --git a/board/amcc/canyonlands/canyonlands.c b/board/amcc/canyonlands/canyonlands.c
index 8292d2d..3551429 100644
--- a/board/amcc/canyonlands/canyonlands.c
+++ b/board/amcc/canyonlands/canyonlands.c
@@ -134,6 +134,18 @@ u32 ddr_clktr(u32 default_val) {
 	return (SDRAM_CLKTR_CLKP_90_DEG_ADV);
 }
 
+#if defined(CONFIG_NAND_U_BOOT)
+/*
+ * NAND booting U-Boot version uses a fixed initialization, since the whole
+ * I2C SPD DIMM autodetection/calibration doesn't fit into the 4k of boot
+ * code.
+ */
+long int initdram(int board_type)
+{
+	return CFG_MBYTES_SDRAM << 20;
+}
+#endif
+
 #if defined(CFG_DRAM_TEST)
 int testdram(void)
 {
@@ -308,14 +320,14 @@ int board_early_init_r (void)
 	 * EBC address which accepts bigger regions:
 	 *
 	 * 0xfc00.0000 -> 4.cc00.0000
-	 *
-	 * For this we have to remap the CS0 and re-relocate the envrironment,
-	 * since the original FLASH location which was needed upon startup is
-	 * now not correct anymore.
 	 */
 
 	/* Remap the NOR FLASH to 0xcc00.0000 ... 0xcfff.ffff */
+#if defined(CONFIG_NAND_U_BOOT) || defined(CONFIG_NAND_SPL)
+	mtebc(pb3cr, CFG_FLASH_BASE_PHYS_L | 0xda000);
+#else
 	mtebc(pb0cr, CFG_FLASH_BASE_PHYS_L | 0xda000);
+#endif
 
 	/* Remove TLB entry of boot EBC mapping */
 	remove_tlb(CFG_BOOT_BASE_ADDR, 16 << 20);
@@ -329,6 +341,13 @@ int board_early_init_r (void)
 	 * 0xfc00.0000 is possible
 	 */
 
+	/*
+	 * Clear potential errors resulting from auto-calibration.
+	 * If not done, then we could get an interrupt later on when
+	 * exceptions are enabled.
+	 */
+	set_mcsr(get_mcsr());
+
 	return 0;
 }
 
diff --git a/board/amcc/canyonlands/init.S b/board/amcc/canyonlands/init.S
index 5d48847..b7cac23 100644
--- a/board/amcc/canyonlands/init.S
+++ b/board/amcc/canyonlands/init.S
@@ -46,7 +46,12 @@ tlbtab:
 	 * use the speed up boot process. It is patched after relocation to
 	 * enable SA_I
 	 */
+#ifndef CONFIG_NAND_SPL
 	tlbentry(CFG_BOOT_BASE_ADDR, SZ_16M, CFG_BOOT_BASE_ADDR, 4, AC_R|AC_W|AC_X|SA_G) /* TLB 0 */
+#else
+	tlbentry(CFG_NAND_BOOT_SPL_SRC, SZ_4K, CFG_NAND_BOOT_SPL_SRC, 4, AC_R|AC_W|AC_X|SA_G)
+	tlbentry(CFG_SDRAM_BASE, SZ_256M, CFG_SDRAM_BASE, 0, AC_R|AC_W|AC_X|SA_G|SA_I)
+#endif
 
 	/*
 	 * TLB entries for SDRAM are not needed on this platform.
@@ -78,7 +83,7 @@ tlbtab:
 	tlbentry(CFG_BCSR_BASE, SZ_1K, CFG_BCSR_BASE, 4, AC_R|AC_W|SA_G|SA_I)
 
 	/* TLB-entry for OCM */
-	tlbentry(CFG_OCM_BASE, SZ_4K, 0x00040000, 4, AC_R|AC_W|AC_X)
+	tlbentry(CFG_OCM_BASE, SZ_16K, 0x00040000, 4, AC_R|AC_W|AC_X|SA_I)
 
 	/* TLB-entry for Local Configuration registers => peripherals */
 	tlbentry(CFG_LOCAL_CONF_REGS, SZ_16M, CFG_LOCAL_CONF_REGS, 4, AC_R|AC_W|AC_X|SA_G|SA_I)
diff --git a/board/amcc/canyonlands/u-boot-nand.lds b/board/amcc/canyonlands/u-boot-nand.lds
new file mode 100644
index 0000000..12a5dcf
--- /dev/null
+++ b/board/amcc/canyonlands/u-boot-nand.lds
@@ -0,0 +1,137 @@
+/*
+ * (C) Copyright 2008
+ * Stefan Roese, DENX Software Engineering, sr@denx.de.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+OUTPUT_ARCH(powerpc)
+SEARCH_DIR(/lib); SEARCH_DIR(/usr/lib); SEARCH_DIR(/usr/local/lib); SEARCH_DIR(/usr/local/powerpc-any-elf/lib);
+SECTIONS
+{
+  /* Read-only sections, merged into text segment: */
+  . = + SIZEOF_HEADERS;
+  .interp : { *(.interp) }
+  .hash          : { *(.hash)		}
+  .dynsym        : { *(.dynsym)		}
+  .dynstr        : { *(.dynstr)		}
+  .rel.text      : { *(.rel.text)		}
+  .rela.text     : { *(.rela.text) 	}
+  .rel.data      : { *(.rel.data)		}
+  .rela.data     : { *(.rela.data) 	}
+  .rel.rodata    : { *(.rel.rodata) 	}
+  .rela.rodata   : { *(.rela.rodata) 	}
+  .rel.got       : { *(.rel.got)		}
+  .rela.got      : { *(.rela.got)		}
+  .rel.ctors     : { *(.rel.ctors)	}
+  .rela.ctors    : { *(.rela.ctors)	}
+  .rel.dtors     : { *(.rel.dtors)	}
+  .rela.dtors    : { *(.rela.dtors)	}
+  .rel.bss       : { *(.rel.bss)		}
+  .rela.bss      : { *(.rela.bss)		}
+  .rel.plt       : { *(.rel.plt)		}
+  .rela.plt      : { *(.rela.plt)		}
+  .init          : { *(.init)	}
+  .plt : { *(.plt) }
+  .text      :
+  {
+    /* WARNING - the following is hand-optimized to fit within	*/
+    /* the sector layout of our flash chips!	XXX FIXME XXX	*/
+
+    cpu/ppc4xx/start.o	(.text)
+
+    /* Align to next NAND block */
+    . = ALIGN(0x4000);
+    common/environment.o  (.ppcenv)
+    /* Keep some space here for redundant env and potential bad env blocks */
+    . = ALIGN(0x10000);
+
+    *(.text)
+    *(.fixup)
+    *(.got1)
+  }
+  _etext = .;
+  PROVIDE (etext = .);
+  .rodata    :
+  {
+    *(.rodata)
+    *(.rodata1)
+    *(.rodata.str1.4)
+  }
+  .fini      : { *(.fini)    } =0
+  .ctors     : { *(.ctors)   }
+  .dtors     : { *(.dtors)   }
+
+  /* Read-write section, merged into data segment: */
+  . = (. + 0x00FF) & 0xFFFFFF00;
+  _erotext = .;
+  PROVIDE (erotext = .);
+  .reloc   :
+  {
+    *(.got)
+    _GOT2_TABLE_ = .;
+    *(.got2)
+    _FIXUP_TABLE_ = .;
+    *(.fixup)
+  }
+  __got2_entries = (_FIXUP_TABLE_ - _GOT2_TABLE_) >>2;
+  __fixup_entries = (. - _FIXUP_TABLE_)>>2;
+
+  .data    :
+  {
+    *(.data)
+    *(.data1)
+    *(.sdata)
+    *(.sdata2)
+    *(.dynamic)
+    CONSTRUCTORS
+  }
+  _edata  =  .;
+  PROVIDE (edata = .);
+
+  . = .;
+  __u_boot_cmd_start = .;
+  .u_boot_cmd : { *(.u_boot_cmd) }
+  __u_boot_cmd_end = .;
+
+
+  . = .;
+  __start___ex_table = .;
+  __ex_table : { *(__ex_table) }
+  __stop___ex_table = .;
+
+  . = ALIGN(256);
+  __init_begin = .;
+  .text.init : { *(.text.init) }
+  .data.init : { *(.data.init) }
+  . = ALIGN(256);
+  __init_end = .;
+
+  __bss_start = .;
+  .bss (NOLOAD)       :
+  {
+   *(.sbss) *(.scommon)
+   *(.dynbss)
+   *(.bss)
+   *(COMMON)
+  }
+
+  _end = . ;
+  PROVIDE (end = .);
+}