From: qianfan <qianfanguijin@163.com>
To: linux-sunxi@lists.linux.dev
Subject: question: How to toggle gpio when init_early
Date: Fri, 29 Apr 2022 12:30:15 +0800 [thread overview]
Message-ID: <2ecb71b6-6df1-6728-3d30-a401e181b326@163.com> (raw)
Hi everyone:
I want toggle a gpio when machine_desc->init_early, but failed.
The gpio is pd24, and I searched the datasheet of r40, the address of
PD_DAT register
is 0x01c20800 + 3 * 0x24 + 0x10. So I modify this register by
__raw_readl and __raw_writel.
The system can't startup when I adding those code.
Seems the physical address can't touch due to mmu.
Can I get some advice?
Thanks
next reply other threads:[~2022-04-29 4:30 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-29 4:30 qianfan [this message]
2022-05-02 23:36 ` question: How to toggle gpio when init_early Samuel Holland
2022-05-05 0:23 ` qianfan
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