[HACK] epiphany: rx: Use static remapping instead of RX mmu

Use static remapping & disable MMU until this is fixed: "Consecutive writes to rxmmu table results in system freeze" aolofsson/oh#50 This prevents weird memory corruption that can otherwise happen with faulty Epiphany programs. Signed-off-by: Ola Jeppsson <[email protected]>
parallella · Mar 25, 2016 · 5d2b302 · 5d2b302
1 parent 2b49f39
commit 5d2b302
Showing 1 changed file with 12 additions and 0 deletions.
diff --git a/drivers/misc/epiphany.c b/drivers/misc/epiphany.c
@@ -723,11 +723,23 @@ static int elink_reset(struct elink_device *elink)
 	txcfg.enable = 1;
 	reg_write(txcfg.reg, elink->regs, ELINK_TXCFG);
 
+
+	/* HACK: Use static remapping until this is fixed:
+	 * "Consecutive writes to rxmmu table results in system freeze"
+	 * https://github.com/parallella/oh/issues/50
+	 */
+#if 0
 	rxcfg.mmu_enable = 1;
 	rxcfg.remap_mode = 0; /* no remapping, only mmu */
 	reg_write(rxcfg.reg, elink->regs, ELINK_RXCFG);
 
 	elink_update_mmu_mappings(elink);
+#else
+	rxcfg.remap_mode = 1;
+	rxcfg.remap_sel = 0xfe0;
+	rxcfg.remap_pattern = 0x3e0;
+	reg_write(rxcfg.reg, elink->regs, ELINK_RXCFG);
+#endif
 
 	ret = configure_adjacent_links(elink);