Date: Fri, 22 May 2015 08:27:30 +0300 From: Daniel Braniss <danny@cs.huji.ac.il> To: Ian Lepore <ian@FreeBSD.org> Cc: hackers@freebsd.org, current@freebsd.org Subject: Re: OF_getprop weirdness - raspberry pi Message-ID: <288BCD94-70F2-46B1-80F8-9755678E3D3F@cs.huji.ac.il> In-Reply-To: <1432218339.1208.1.camel@freebsd.org> References: <D0B40E58-32EB-4CFE-950E-78EAA05E9018@cs.huji.ac.il> <1432218339.1208.1.camel@freebsd.org>
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> On May 21, 2015, at 5:25 PM, Ian Lepore <ian@FreeBSD.org> wrote:
>
> On Thu, 2015-05-21 at 09:41 +0300, Daniel Braniss wrote:
>> Hi,
>> I’m running current as of last week on a raspberry pi B.
>>
>> i don’t know if this only related to arm, but this is what I have in my rpi-b.dts:
>> ….
>> spi0 {
>> rfid0 {
>> compatible = "rfid,mfrc5";
>> spi-chipselect = <0>;
>> reset {
>> compatible = "pcd-reset";
>> gpios = <&gpio 6 2>;
>> };
>> lock {
>> compatible = "lock-1";
>> gpios = <&gpio 13 2>;
>> };
>> sense {
>> compatible = "sense-1";
>> gpios = <&gpio 19 1>;
>> };
>> };
>> …
>> and a call to
>> uint32_t data[3];
>>
>> OF_getprop(node, “gpios”, data, sizeof(data)); // node is ‘pcd-reset'
>> returns:
>> data[0]: 0x03000000
>> data[1]: 0x06000000
>> data[2]: 0x02000000
>>
>> which looks to me that it’s in the wrong endian?
>>
>> cheers,
>> danny
>
> FDT data is always big-endian, use OF_getencprop() to unpack it to host
> format.
>
thanks!
is there (apart from the source), some man pages, doc? so far I found outdated,
or incomplete info.
danny
> -- Ian
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