Is a 12 MB/s microSD overkill for what the glamo driver does?
jimcolt at gmail.com
Wed Jul 30 23:38:18 CEST 2008
If anyone cares this is the card I have coming and will speed test by using
dd(1) from the device to dev/null. But as Tim said the bus speed the Glamo
On Wed, Jul 30, 2008 at 3:07 PM, Jim Colton <jimcolt at gmail.com> wrote:
> Oh well, I should have bought a slower card. At least it won't be a
> limiting factor.
> I'll compare speeds I get with your 3M bytes/sec. anyway.
> I was meaning 12 megabits /sec....
> By 12MB/s I was referencing what I see here
> 12MB/s is not in the table shown in that link however I am about to receive
> a 4G 80x or 12MB/s card in the mail .
> Thanks for your input Tim and Andy,
> On Wed, Jul 30, 2008 at 1:05 PM, Andy Green <andy at openmoko.com> wrote:
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>> Somebody in the thread at some point said:
>> | Hey Tim,
>> | "no" it's not overkill or "no" is the glamo driver able to read that
>> | Are you involved with or knowledgeable of how the glamo drive works?
>> | I'm not.
>> I have that not very marketable distinction.
>> We read from it at 16MHz / 4 bits, so not sure where this 12MBytes/sec
>> figure came from. "Reading from SD Card" means collecting the block
>> data into Glamo RAM, after we have it there we have to copy it into CPU
>> RAM additionally.
>> With some pending Glamo speedup patches in, effective Read speed is
>> around 3MBytes/sec measured by md5sum-ing a 40MByte test file.
>> - -Andy
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