select DM_SERIAL
imply DM_SPI
imply DM_SPI_FLASH
+ select LAST_STAGE_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
return 0;
}
+
+int last_stage_init(void)
+{
+ void *src, *dst;
+
+ src = malloc(SZ_64K);
+ dst = malloc(SZ_64K);
+ if (!src || !dst) {
+ printf("Can't allocate buffer for cache cleanup copy!\n");
+ return 0;
+ }
+
+ /*
+ * 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. Copying an area of 64KiB
+ * in DDR at a very late bootup time in U-Boot, directly before
+ * calling into the prompt, seems to fix this issue.
+ */
+ memcpy(dst, src, SZ_64K);
+ free(src);
+ free(dst);
+
+ return 0;
+}