powerpc: ppc4xx: Add ramboot config for glacier

Add a new ramboot config for glacier so that it is possible to test U-Boot
loaded over Ethernet instead of using JTAG.

Signed-off-by: Simon Glass <sjg@chromium.org>

arch/powerpc/cpu/ppc4xx/44x_spd_ddr2.c

@@ -424,6 +424,14 @@ phys_size_t initdram(int board_type)
 	int write_recovery;
 	phys_size_t dram_size = 0;
 
+	if (IS_ENABLED(CONFIG_SYS_RAMBOOT)) {
+		/*
+		 * Reduce RAM size to avoid overwriting memory used by
+		 * current stack? Not sure what is happening.
+		 */
+		return sdram_memsize() / 2;
+	}
+
 	num_dimm_banks = sizeof(iic0_dimm_addr);
 
 	/*------------------------------------------------------------------

board/amcc/canyonlands/MAINTAINERS

@@ -6,3 +6,4 @@ F:	include/configs/canyonlands.h
 F:	configs/arches_defconfig
 F:	configs/canyonlands_defconfig
 F:	configs/glacier_defconfig
+F:	configs/glacier_ramboot_defconfig

board/amcc/canyonlands/u-boot-ram.lds

@@ -0,0 +1,79 @@
+/*
+ * (C) Copyright 2009
+ * Stefan Roese, DENX Software Engineering, sr@denx.de.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+OUTPUT_ARCH(powerpc)
+SECTIONS
+{
+  /* Read-only sections, merged into text segment: */
+  . = + SIZEOF_HEADERS;
+  .text      :
+  {
+    arch/powerpc/cpu/ppc4xx/start.o	(.text*)
+    board/amcc/canyonlands/init.o	(.text*)
+
+    *(.text*)
+  }
+  _etext = .;
+  PROVIDE (etext = .);
+  .rodata    :
+  {
+    *(SORT_BY_ALIGNMENT(SORT_BY_NAME(.rodata*)))
+  }
+
+  /* Read-write section, merged into data segment: */
+  . = (. + 0x00FF) & 0xFFFFFF00;
+  _erotext = .;
+  PROVIDE (erotext = .);
+  .reloc   :
+  {
+    KEEP(*(.got))
+    _GOT2_TABLE_ = .;
+    KEEP(*(.got2))
+    _FIXUP_TABLE_ = .;
+    KEEP(*(.fixup))
+  }
+  __got2_entries = (_FIXUP_TABLE_ - _GOT2_TABLE_) >>2;
+  __fixup_entries = (. - _FIXUP_TABLE_)>>2;
+
+  .data    :
+  {
+    *(.data*)
+    *(.sdata*)
+  }
+  _edata  =  .;
+  PROVIDE (edata = .);
+
+  . = .;
+
+  .u_boot_list : {
+	KEEP(*(SORT(.u_boot_list*)));
+  }
+
+  . = .;
+  __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)       :
+  {
+   *(.bss*)
+   *(.sbss*)
+   *(COMMON)
+   . = ALIGN(4);
+  }
+
+  __bss_end = . ;
+  PROVIDE (end = .);
+}

configs/glacier_ramboot_defconfig

@@ -0,0 +1,5 @@
+CONFIG_SYS_EXTRA_OPTIONS="SYS_RAMBOOT,SYS_TEXT_BASE=0x01000000,SYS_LDSCRIPT=board/amcc/canyonlands/u-boot-ram.lds"
+CONFIG_PPC=y
+CONFIG_4xx=y
+CONFIG_TARGET_CANYONLANDS=y
+CONFIG_GLACIER=y