[U-Boot] [PATCH 1/2] mips: mt76xx: Flush d-cache in arch_misc_init() to solve d-cache issues
Stefan Roese
sr at denx.de
Tue Dec 18 09:27:14 UTC 2018
It has been noticed, that sometimes the d-cache is not in a
"clean-state" when U-Boot is running on MT7688. This was detected when
using the ethernet driver (which uses d-cache) and a TFTP command does
not complete. Flushing the complete d-cache (again?) here seems to fix
this issue.
Signed-off-by: Stefan Roese <sr at denx.de>
Cc: Daniel Schwierzeck <daniel.schwierzeck at gmail.com>
---
arch/mips/Kconfig | 2 +-
arch/mips/mach-mt7620/cpu.c | 14 +++++++++++++-
2 files changed, 14 insertions(+), 2 deletions(-)
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 1b1b1d7d00..355d3b4d91 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -79,7 +79,7 @@ config ARCH_MT7620
select DM_SERIAL
imply DM_SPI
imply DM_SPI_FLASH
- select ARCH_MISC_INIT if WATCHDOG
+ select ARCH_MISC_INIT
select MIPS_TUNE_24KC
select OF_CONTROL
select ROM_EXCEPTION_VECTORS
diff --git a/arch/mips/mach-mt7620/cpu.c b/arch/mips/mach-mt7620/cpu.c
index 87cc973b75..9e0ca716f7 100644
--- a/arch/mips/mach-mt7620/cpu.c
+++ b/arch/mips/mach-mt7620/cpu.c
@@ -89,9 +89,21 @@ void watchdog_reset(void)
wdt_reset(watchdog_dev);
}
}
+#endif
int arch_misc_init(void)
{
+ /*
+ * It has been noticed, that sometimes the d-cache is not in a
+ * "clean-state" when U-Boot is running on MT7688. This was
+ * detected when using the ethernet driver (which uses d-cache)
+ * and a TFTP command does not complete. Flushing the complete
+ * d-cache (again?) here seems to fix this issue.
+ */
+ flush_dcache_range(gd->bd->bi_memstart,
+ gd->bd->bi_memstart + gd->ram_size - 1);
+
+#ifdef CONFIG_WATCHDOG
/* Init watchdog */
if (uclass_get_device_by_seq(UCLASS_WDT, 0, &watchdog_dev)) {
debug("Watchdog: Not found by seq!\n");
@@ -103,7 +115,7 @@ int arch_misc_init(void)
wdt_start(watchdog_dev, 60000, 0); /* 60 seconds */
printf("Watchdog: Started\n");
+#endif
return 0;
}
-#endif
--
2.20.1
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