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@@ -68,3 +68,29 @@ int print_cpuinfo(void)
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return 0;
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}
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+
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+int last_stage_init(void)
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+{
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+ void *src, *dst;
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+
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+ src = malloc(SZ_64K);
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+ dst = malloc(SZ_64K);
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+ if (!src || !dst) {
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+ printf("Can't allocate buffer for cache cleanup copy!\n");
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+ return 0;
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+ }
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+
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+ /*
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+ * It has been noticed, that sometimes the d-cache is not in a
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+ * "clean-state" when U-Boot is running on MT7688. This was
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+ * detected when using the ethernet driver (which uses d-cache)
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+ * and a TFTP command does not complete. Copying an area of 64KiB
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+ * in DDR at a very late bootup time in U-Boot, directly before
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+ * calling into the prompt, seems to fix this issue.
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+ */
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+ memcpy(dst, src, SZ_64K);
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+ free(src);
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+ free(dst);
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+
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+ return 0;
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+}
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