Re: [U-Boot-Users] drivers MMCplus for at91sam9x
On Tue, Apr 15, 2008 at 5:18 AM, Pierre Savary pierre.savary@kerlink.fr wrote:
Then my MMC 4GB works with my Linux kernel but if I can't load my kernel (located on the first part of this MMC) ... it's not really interesting :(
So, somebody does already use MMC v4 with U-boot???
I've got one that works. However, I don't have a 4GB MMC card with v4. I thought I did, but it turned out the card just takes advantage of the fact that older versions can address 4GB, even though the spec says 2GB is the max.
However, I'm fairly confident in the code (it's been tested in simulated environments, and reflects what the Linux code does). I'm currently working on bringing it forward to the top of tree (I started it before drivers/ got rearranged). I'm actually hoping to generalize it some so we can share it between all MMC/SD users.
Andy
Hi, Perhaps that I could help you...? I could test it with many different MMC (2GB, 4GB, 8GB) (Samsung and Micron). Could you share with me your source code? Thanks in advance for your help,
Best Regards
Pierre
-----Message d'origine----- De : u-boot-users-bounces@lists.sourceforge.net [mailto:u-boot-users-bounces@lists.sourceforge.net] De la part de Andy Fleming Envoyé : mardi 15 avril 2008 21:25 À : Pierre Savary Cc : u-boot-users@lists.sourceforge.net; drzeus-mmc@drzeus.cx Objet : Re: [U-Boot-Users] drivers MMCplus for at91sam9x
On Tue, Apr 15, 2008 at 5:18 AM, Pierre Savary pierre.savary@kerlink.fr wrote:
Then my MMC 4GB works with my Linux kernel but if I can't load my kernel (located on the first part of this MMC) ... it's not really interesting
:(
So, somebody does already use MMC v4 with U-boot???
I've got one that works. However, I don't have a 4GB MMC card with v4. I thought I did, but it turned out the card just takes advantage of the fact that older versions can address 4GB, even though the spec says 2GB is the max.
However, I'm fairly confident in the code (it's been tested in simulated environments, and reflects what the Linux code does). I'm currently working on bringing it forward to the top of tree (I started it before drivers/ got rearranged). I'm actually hoping to generalize it some so we can share it between all MMC/SD users.
Andy
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Congratulations! It will be great to have MMC v4.x support in U-Boot.
The following segment of code from linux-2.6.25-rc9/drivers/mmc/host/at91_mci.c is confusing:
if (host->board->wire4) { if (cpu_is_at91sam9260() || cpu_is_at91sam9263()) mmc->caps |= MMC_CAP_4_BIT_DATA; else dev_warn(&pdev->dev, "4 wire bus mode not supported" " - using 1 wire\n"); }
This code seems to imply that MMC 4 bits works on the AT91SAM9260 and AT91SAM9263, but not any of the others in this processor family, possibly due to a hardware bug. Any comments on why the Linux AT91 MCI driver doesn't support an 4 bit MMC bus for all AT91SAM9 processors?
I mention this because it may impact the AT91 MCI U-Boot device driver.
Sincerely,
Ken Fuchs
-----Original Message----- From: u-boot-users-bounces@lists.sourceforge.net [mailto:u-boot-users-bounces@lists.sourceforge.net] On Behalf Of Andy Fleming Sent: Tuesday, April 15, 2008 14:25 To: Pierre Savary Cc: u-boot-users@lists.sourceforge.net; drzeus-mmc@drzeus.cx Subject: Re: [U-Boot-Users] drivers MMCplus for at91sam9x
On Tue, Apr 15, 2008 at 5:18 AM, Pierre Savary pierre.savary@kerlink.fr wrote:
Then my MMC 4GB works with my Linux kernel but if I can't
load my kernel
(located on the first part of this MMC) ... it's not
really interesting :(
So, somebody does already use MMC v4 with U-boot???
I've got one that works. However, I don't have a 4GB MMC card with v4. I thought I did, but it turned out the card just takes advantage of the fact that older versions can address 4GB, even though the spec says 2GB is the max.
However, I'm fairly confident in the code (it's been tested in simulated environments, and reflects what the Linux code does). I'm currently working on bringing it forward to the top of tree (I started it before drivers/ got rearranged). I'm actually hoping to generalize it some so we can share it between all MMC/SD users.
Andy
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Hi Andy, Where could we find the driver that works with MMCv4 on at91sam9x? Best regards
Pierre
-----Message d'origine----- De : u-boot-users-bounces@lists.sourceforge.net [mailto:u-boot-users-bounces@lists.sourceforge.net] De la part de Andy Fleming Envoyé : mardi 15 avril 2008 21:25 À : Pierre Savary Cc : u-boot-users@lists.sourceforge.net; drzeus-mmc@drzeus.cx Objet : Re: [U-Boot-Users] drivers MMCplus for at91sam9x
On Tue, Apr 15, 2008 at 5:18 AM, Pierre Savary pierre.savary@kerlink.fr wrote:
Then my MMC 4GB works with my Linux kernel but if I can't load my kernel (located on the first part of this MMC) ... it's not really interesting
:(
So, somebody does already use MMC v4 with U-boot???
I've got one that works. However, I don't have a 4GB MMC card with v4. I thought I did, but it turned out the card just takes advantage of the fact that older versions can address 4GB, even though the spec says 2GB is the max.
However, I'm fairly confident in the code (it's been tested in simulated environments, and reflects what the Linux code does). I'm currently working on bringing it forward to the top of tree (I started it before drivers/ got rearranged). I'm actually hoping to generalize it some so we can share it between all MMC/SD users.
Andy
------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javao ne _______________________________________________ U-Boot-Users mailing list U-Boot-Users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/u-boot-users
participants (3)
-
Andy Fleming -
Ken.Fuchs＠bench.com -
Pierre Savary