58 lines
2 KiB
Diff
58 lines
2 KiB
Diff
From b99050b7f7480499855dec85be2deac75db5fc62 Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.org>
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Date: Fri, 5 Dec 2014 17:26:26 +0000
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Subject: [PATCH 65/99] fdt: Add support for the CONFIG_CMDLINE_EXTEND option
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---
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drivers/of/fdt.c | 29 ++++++++++++++++++++++++-----
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1 file changed, 24 insertions(+), 5 deletions(-)
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--- a/drivers/of/fdt.c
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+++ b/drivers/of/fdt.c
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@@ -901,22 +901,38 @@ int __init early_init_dt_scan_chosen(uns
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/* Retrieve command line */
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p = of_get_flat_dt_prop(node, "bootargs", &l);
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- if (p != NULL && l > 0)
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- strlcpy(data, p, min((int)l, COMMAND_LINE_SIZE));
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- p = of_get_flat_dt_prop(node, "bootargs-append", &l);
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- if (p != NULL && l > 0)
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- strlcat(data, p, min_t(int, strlen(data) + (int)l, COMMAND_LINE_SIZE));
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/*
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* CONFIG_CMDLINE is meant to be a default in case nothing else
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* managed to set the command line, unless CONFIG_CMDLINE_FORCE
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* is set in which case we override whatever was found earlier.
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+ *
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+ * However, it can be useful to be able to treat the default as
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+ * a starting point to be extended using CONFIG_CMDLINE_EXTEND.
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*/
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+ ((char *)data)[0] = '\0';
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+
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#ifdef CONFIG_CMDLINE
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-#ifndef CONFIG_CMDLINE_FORCE
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- if (!((char *)data)[0])
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+ strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
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+
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+ if (p != NULL && l > 0) {
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+#if defined(CONFIG_CMDLINE_EXTEND)
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+ int len = strlen(data);
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+ if (len > 0) {
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+ strlcat(data, " ", COMMAND_LINE_SIZE);
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+ len++;
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+ }
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+ strlcpy((char *)data + len, p, min((int)l, COMMAND_LINE_SIZE - len));
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+#elif defined(CONFIG_CMDLINE_FORCE)
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+ pr_warning("Ignoring bootargs property (using the default kernel command line)\n");
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+#else
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+ /* Neither extend nor force - just override */
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+ strlcpy(data, p, min((int)l, COMMAND_LINE_SIZE));
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#endif
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- strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
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+ }
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+#else /* CONFIG_CMDLINE */
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+ if (p != NULL && l > 0)
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+ strlcpy(data, p, min((int)l, COMMAND_LINE_SIZE));
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#endif /* CONFIG_CMDLINE */
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pr_debug("Command line is: %s\n", (char*)data);
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