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-rw-r--r--board/amcc/sequoia/init.S7
1 files changed, 7 insertions, 0 deletions
diff --git a/board/amcc/sequoia/init.S b/board/amcc/sequoia/init.S
index 4452d26..3c0e400 100644
--- a/board/amcc/sequoia/init.S
+++ b/board/amcc/sequoia/init.S
@@ -43,12 +43,19 @@ tlbtab:
/* vxWorks needs this as first entry for the Machine Check interrupt */
tlbentry( 0x40000000, SZ_256M, 0, 0, AC_R|AC_W|AC_X|SA_G|SA_I )
+ /*
+ * The RAM-boot version skips the SDRAM TLB (identified by EPN=0). This
+ * entry is already configured for SDRAM via the JTAG debugger and mustn't
+ * be re-initialized by this RAM-booting U-Boot version.
+ */
+#ifndef CONFIG_SYS_RAMBOOT
/* TLB-entry for DDR SDRAM (Up to 2GB) */
#ifdef CONFIG_4xx_DCACHE
tlbentry( CONFIG_SYS_SDRAM_BASE, SZ_256M, CONFIG_SYS_SDRAM_BASE, 0, AC_R|AC_W|AC_X|SA_G)
#else
tlbentry( CONFIG_SYS_SDRAM_BASE, SZ_256M, CONFIG_SYS_SDRAM_BASE, 0, AC_R|AC_W|AC_X|SA_G|SA_I )
#endif
+#endif /* CONFIG_SYS_RAMBOOT */
/* TLB-entry for EBC */
tlbentry( CONFIG_SYS_BCSR_BASE, SZ_256M, CONFIG_SYS_BCSR_BASE, 1, AC_R|AC_W|AC_X|SA_G|SA_I )