On 4/13/21 7:16 AM, Sascha Hauer wrote:
> On Fri, Apr 09, 2021 at 10:15:03AM +0200, Bastian Krause wrote:
>> From: Ahmad Fatoum <[email protected]>
>>
>> By default, barebox overwrites the bootargs in the oftree if it itself
>> has any. Make this behavior configurable by adding a new global
>> variable. It allows either overwriting the oftree bootargs
>> (global.linux.bootargs_overwrite=1) or appending barebox' bootargs to
>> the oftree bootargs (global.linux.bootargs_overwrite=0).
>>
>> Signed-off-by: Ahmad Fatoum <[email protected]>
>> [bst: dropped a new line removal, extend commit message]
>> Signed-off-by: Bastian Krause <[email protected]>
>> ---
>> common/oftree.c | 22 +++++++++++++++++++++-
>> 1 file changed, 21 insertions(+), 1 deletion(-)
>>
>> diff --git a/common/oftree.c b/common/oftree.c
>> index aaeb199a9e..f3a5d9c5d1 100644
>> --- a/common/oftree.c
>> +++ b/common/oftree.c
>> @@ -16,6 +16,7 @@
>> #include <reset_source.h>
>> #include <watchdog.h>
>> #include <globalvar.h>
>> +#include <magicvar.h>
>>
>> #define MAX_LEVEL 32 /* how deeply nested we will go */
>>
>> @@ -161,9 +162,14 @@ static void watchdog_build_bootargs(struct watchdog
>> *watchdog, struct device_nod
>> free(buf);
>> }
>>
>> +static int bootargs_overwrite = 1;
>> +BAREBOX_MAGICVAR(global.linux.bootargs_overwrite, "overwrite original
>> oftree bootargs");
>
> How about naming it global.linux.bootargs_append instead? It would make
> it more clear that we are deviating from the default by setting the
> variable to true.
>
That's fine with me.
Can you change that or should I send a v2?
Bastian
>
>> +
>> static int of_write_bootargs(struct device_node *node)
>> {
>> const char *str;
>> + char *buf = NULL;
>> + int ret;
>>
>> if (IS_ENABLED(CONFIG_SYSTEMD_OF_WATCHDOG))
>> watchdog_build_bootargs(boot_get_enabled_watchdog(),
>> of_get_parent(node));
>> @@ -176,7 +182,20 @@ static int of_write_bootargs(struct device_node *node)
>> if (strlen(str) == 0)
>> return 0;
>>
>> - return of_property_write_string(node, "bootargs", str);
>> + if (!bootargs_overwrite) {
>> + const char *oldstr;
>> +
>> + ret = of_property_read_string(node, "bootargs", &oldstr);
>> + if (!ret) {
>> + str = buf = basprintf("%s %s", oldstr, str);
>> + if (!buf)
>> + return -ENOMEM;
>> + }
>> + }
>> +
>> + ret = of_property_write_string(node, "bootargs", str);
>> + free(buf);
>> + return ret;
>> }
>>
>> static int of_fixup_bootargs(struct device_node *root, void *unused)
>> @@ -218,6 +237,7 @@ static int of_fixup_bootargs(struct device_node *root,
>> void *unused)
>>
>> static int of_register_bootargs_fixup(void)
>> {
>> + globalvar_add_simple_bool("linux.bootargs_overwrite",
>> &bootargs_overwrite);
>> return of_register_fixup(of_fixup_bootargs, NULL);
>> }
>> late_initcall(of_register_bootargs_fixup);
>> --
>> 2.29.2
>>
>>
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>>
>
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