With commit 06985289d452 ("watchdog: Implement generic watchdog_reset() version") the init sequence has changed in arch_misc_init(), resulting in a re-appearance of the d-cache issue on MT7688 boards (e.g. gardena). When this happens, the first (or sometimes later ones as well) TFTP command hangs and does not complete correctly. This leads to the assumption that the d-cache is not in a clean state once the ethernet driver is called (d-cache is used here for the buffers). The old work- around with the cache flush somehow does not work any more now with the new code change.

To fix this issue, this patch now removes the old workaround and selects CONFIG_SYS_MALLOC_CLEAR_ON_INIT for ARCH_MTMIPS. With this option the complete malloc area is initialized with zeros (cache lines are touched). Testing has shown that this also fixes the issue on the MT7688 boards.

Signed-off-by: Stefan Roese sr@denx.de Suggested-by: Daniel Schwierzeck daniel.schwierzeck@gmail.com Cc: Daniel Schwierzeck daniel.schwierzeck@gmail.com --- v2: - As suggested by Daniel, remove the workaround (hack) and select CONFIG_SYS_MALLOC_CLEAR_ON_INIT instead

arch/mips/Kconfig | 2 +- arch/mips/mach-mtmips/cpu.c | 15 --------------- 2 files changed, 1 insertion(+), 16 deletions(-)

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index 9cf8e9800d..5cb9bdf2ee 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -84,13 +84,13 @@ config ARCH_MTMIPS select DM_SERIAL imply DM_SPI imply DM_SPI_FLASH - select ARCH_MISC_INIT select MIPS_TUNE_24KC select OF_CONTROL select ROM_EXCEPTION_VECTORS select SUPPORTS_CPU_MIPS32_R1 select SUPPORTS_CPU_MIPS32_R2 select SUPPORTS_LITTLE_ENDIAN + select SYS_MALLOC_CLEAR_ON_INIT select SYSRESET

config ARCH_JZ47XX diff --git a/arch/mips/mach-mtmips/cpu.c b/arch/mips/mach-mtmips/cpu.c index fcd0484a6d..b0a6397d68 100644 --- a/arch/mips/mach-mtmips/cpu.c +++ b/arch/mips/mach-mtmips/cpu.c @@ -68,18 +68,3 @@ int print_cpuinfo(void)

return 0; } - -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); - - return 0; -}