Das U-Boot: Universal Boot Loader

diff --git a/board/RRvision/RRvision.c b/board/RRvision/RRvision.c
new file mode 100644 (file)
index 0000000..d6f5c2a
--- /dev/null
+++ b/board/RRvision/RRvision.c
@@ -0,0 +1,268 @@
+/*
+ * (C) Copyright 2001-2002
+ * Wolfgang Denk, DENX Software Engineering, wd@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
+ */
+
+#include <common.h>
+#include <mpc8xx.h>
+
+/* ------------------------------------------------------------------------- */
+
+static long int dram_size (long int, long int *, long int);
+
+/* ------------------------------------------------------------------------- */
+
+#define        _NOT_USED_      0xFFFFFFFF
+
+const uint sdram_table[] =
+{
+       /*
+        * Single Read. (Offset 0 in UPMA RAM)
+        */
+       0x1F07FC04, 0xEEAEFC04, 0x11ADFC04, 0xEFBBBC00,
+       0x1FF77C47, /* last */
+       /*
+        * SDRAM Initialization (offset 5 in UPMA RAM)
+        *
+        * This is no UPM entry point. The following definition uses
+        * the remaining space to establish an initialization
+        * sequence, which is executed by a RUN command.
+        *
+        */
+                   0x1FF77C34, 0xEFEABC34, 0x1FB57C35, /* last */
+       /*
+        * Burst Read. (Offset 8 in UPMA RAM)
+        */
+       0x1F07FC04, 0xEEAEFC04, 0x10ADFC04, 0xF0AFFC00,
+       0xF0AFFC00, 0xF1AFFC00, 0xEFBBBC00, 0x1FF77C47, /* last */
+       _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
+       _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
+       /*
+        * Single Write. (Offset 18 in UPMA RAM)
+        */
+       0x1F07FC04, 0xEEAEBC00, 0x01B93C04, 0x1FF77C47, /* last */
+       _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
+       /*
+        * Burst Write. (Offset 20 in UPMA RAM)
+        */
+       0x1F07FC04, 0xEEAEBC00, 0x10AD7C00, 0xF0AFFC00,
+       0xF0AFFC00, 0xE1BBBC04, 0x1FF77C47, /* last */
+                                           _NOT_USED_,
+       _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
+       _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
+       /*
+        * Refresh  (Offset 30 in UPMA RAM)
+        */
+       0x1FF5FC84, 0xFFFFFC04, 0xFFFFFC04, 0xFFFFFC04,
+       0xFFFFFC84, 0xFFFFFC07, /* last */
+                               _NOT_USED_, _NOT_USED_,
+       _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
+       /*
+        * Exception. (Offset 3c in UPMA RAM)
+        */
+       0x7FFFFC07, /* last */
+                   _NOT_USED_, _NOT_USED_, _NOT_USED_,
+};
+
+/* ------------------------------------------------------------------------- */
+
+
+/*
+ * Check Board Identity:
+ *
+ * Always return 1 (no second DRAM bank).
+ */
+
+int checkboard (void)
+{
+       unsigned char *s = getenv ("serial#");
+
+       puts ("Board: RRvision ");
+
+       for (; s && *s; ++s) {
+               if (*s == ' ')
+                       break;
+               putc (*s);
+       }
+
+       putc ('\n');
+
+       return (0);
+}
+
+/* ------------------------------------------------------------------------- */
+
+long int initdram (int board_type)
+{
+       volatile immap_t *immap = (immap_t *) CFG_IMMR;
+       volatile memctl8xx_t *memctl = &immap->im_memctl;
+       unsigned long reg;
+       long int size8, size9;
+       long int size = 0;
+
+       upmconfig (UPMA, (uint *)sdram_table, sizeof(sdram_table) / sizeof(uint));
+
+       /*
+        * Preliminary prescaler for refresh (depends on number of
+        * banks): This value is selected for four cycles every 62.4 us
+        * with two SDRAM banks or four cycles every 31.2 us with one
+        * bank. It will be adjusted after memory sizing.
+        */
+       memctl->memc_mptpr = CFG_MPTPR_2BK_8K;
+
+       memctl->memc_mar = 0x00000088;
+
+       /*
+        * Map controller bank 1 the SDRAM bank 2 at physical address 0.
+        */
+       memctl->memc_or1 = CFG_OR2_PRELIM;
+       memctl->memc_br1 = CFG_BR2_PRELIM;
+
+       memctl->memc_mamr = CFG_MAMR_8COL & (~(MAMR_PTAE));     /* no refresh yet */
+
+       udelay (200);
+
+       /* perform SDRAM initializsation sequence */
+
+       memctl->memc_mcr = 0x80002105;  /* SDRAM bank 0 */
+       udelay (1);
+       memctl->memc_mcr = 0x80002230;  /* SDRAM bank 0 - execute twice */
+       udelay (1);
+
+       memctl->memc_mamr |= MAMR_PTAE; /* enable refresh */
+
+       udelay (1000);
+
+       /*
+        * Check Bank 0 Memory Size
+        *
+        * try 8 column mode
+        */
+       size8 = dram_size (CFG_MAMR_8COL,
+                          (ulong *)SDRAM_BASE2_PRELIM,
+                          SDRAM_MAX_SIZE);
+
+       udelay (1000);
+
+       /*
+        * try 9 column mode
+        */
+       size9 = dram_size (CFG_MAMR_9COL,
+                          (ulong *) SDRAM_BASE2_PRELIM,
+                          SDRAM_MAX_SIZE);
+
+       if (size8 < size9) {            /* leave configuration at 9 columns */
+               size = size9;
+/*             debug ("SDRAM Bank 0 in 9 column mode: %ld MB\n", size >> 20);  */
+       } else {                        /* back to 8 columns            */
+               size = size8;
+               memctl->memc_mamr = CFG_MAMR_8COL;
+               udelay (500);
+/*             debug ("SDRAM Bank 0 in 8 column mode: %ld MB\n", size >> 20);  */
+       }
+
+       udelay (1000);
+
+       /*
+        * Adjust refresh rate depending on SDRAM type
+        * For types > 128 MBit leave it at the current (fast) rate
+        */
+       if (size < 0x02000000) {
+               /* reduce to 15.6 us (62.4 us / quad) */
+               memctl->memc_mptpr = CFG_MPTPR_2BK_4K;
+               udelay (1000);
+       }
+
+       /*
+        * Final mapping
+        */
+       memctl->memc_or1 = ((-size) & 0xFFFF0000) | CFG_OR_TIMING_SDRAM;
+       memctl->memc_br1 = (CFG_SDRAM_BASE & BR_BA_MSK) | BR_MS_UPMA | BR_V;
+
+       /*
+        * No bank 1
+        *
+        * invalidate bank
+        */
+       memctl->memc_br3 = 0;
+
+       /* adjust refresh rate depending on SDRAM type, one bank */
+       reg = memctl->memc_mptpr;
+       reg >>= 1;                      /* reduce to CFG_MPTPR_1BK_8K / _4K */
+       memctl->memc_mptpr = reg;
+
+       udelay (10000);
+
+       return (size);
+}
+
+/* ------------------------------------------------------------------------- */
+
+/*
+ * Check memory range for valid RAM. A simple memory test determines
+ * the actually available RAM size between addresses `base' and
+ * `base + maxsize'. Some (not all) hardware errors are detected:
+ * - short between address lines
+ * - short between data lines
+ */
+
+static long int dram_size (long int mamr_value, long int *base,
+                                                  long int maxsize)
+{
+       volatile immap_t *immap = (immap_t *) CFG_IMMR;
+       volatile memctl8xx_t *memctl = &immap->im_memctl;
+       volatile long int *addr;
+       ulong cnt, val;
+       ulong save[32];                 /* to make test non-destructive */
+       unsigned char i = 0;
+
+       memctl->memc_mamr = mamr_value;
+
+       for (cnt = maxsize / sizeof (long); cnt > 0; cnt >>= 1) {
+               addr = base + cnt;      /* pointer arith! */
+
+               save[i++] = *addr;
+               *addr = ~cnt;
+       }
+
+       /* write 0 to base address */
+       addr = base;
+       save[i] = *addr;
+       *addr = 0;
+
+       /* check at base address */
+       if ((val = *addr) != 0) {
+               *addr = save[i];
+               return (0);
+       }
+
+       for (cnt = 1; cnt <= maxsize / sizeof (long); cnt <<= 1) {
+               addr = base + cnt;      /* pointer arith! */
+
+               val = *addr;
+               *addr = save[--i];
+
+               if (val != (~cnt)) {
+                       return (cnt * sizeof (long));
+               }
+       }
+       return (maxsize);
+}