board/tqm85xx: Create and tear down TLB for get_ram_size()
We need a TLB entry to call get_ram_size(); the common code doesn't create
one until *after* fixed_sdram() has determined the size. So we set up tlbs
for the max possible size and tear them down once we're done with
get_ram_size(); the common 85xx code will then set up a final set of tlb
entries for the *actual* detected size of ddr.
This prevents us from having TLB entries that are larger than DDR sitting
around for very long, which is not a recommended scenario.
Signed-off-by: Becky Bruce <beckyb@kernel.crashing.org>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/board/tqc/tqm85xx/sdram.c b/board/tqc/tqm85xx/sdram.c
index 39a9e21..baf073e 100644
--- a/board/tqc/tqm85xx/sdram.c
+++ b/board/tqc/tqm85xx/sdram.c
@@ -363,6 +363,12 @@
udelay (1000);
#endif /* CONFIG_TQM8548 */
+ /*
+ * get_ram_size() depends on having tlbs for the DDR, but they are
+ * not yet setup because we don't know the size. Set up a temp
+ * mapping and delete it when done.
+ */
+ setup_ddr_tlbs(CONFIG_SYS_DDR_EARLY_SIZE_MB);
for (i = 0; i < N_DDR_CS_CONF; i++) {
ddr->cs0_config = ddr_cs_conf[i].reg;
@@ -376,6 +382,7 @@
break;
}
}
+ clear_ddr_tlbs(CONFIG_SYS_DDR_EARLY_SIZE_MB);
#ifdef CONFIG_TQM8548
if (i < N_DDR_CS_CONF) {