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mips: mt76xx: Flush d-cache in arch_misc_init() to solve d-cache issues

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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@denx.de>
Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
This commit is contained in:
Stefan Roese 2018-12-18 10:27:14 +01:00 committed by Daniel Schwierzeck
parent 8da7495299
commit a5f50e0114
2 changed files with 14 additions and 2 deletions
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2
arch/mips/Kconfig
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@ -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

14
arch/mips/mach-mt7620/cpu.c
View file

@ -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