[U-Boot] [PATCH] mxs: mxsboot: Add support for SD card generation for i.MX23

[Marek Vasut]

Dear Otavio Salvador,

> On Thu, Jan 24, 2013 at 4:08 PM, Marek Vasut <marex at denx.de> wrote:
> > Dear Otavio Salvador,
> > 
> >> On Thu, Jan 24, 2013 at 3:56 PM, Marek Vasut <marex at denx.de> wrote:
> >> > Dear Otavio Salvador,
> >> > 
> >> >> The mxsboot now receives the SoC type as parameter to generate binary
> >> >> compatible with the SoC. Currently the NAND support has not been add
> >> >> for i.MX23 as it is not yet supported in U-Boot.
> >> > 
> >> > Please fix the NAND support as well, then resubmit.
> >> 
> >> I won't work on NAND now; first I wish to fix the NAND driver support
> >> to later work in boot support.
> >> 
> >> > The patch basically does dd if=u-boot.sb ... bs=512 seek=4 ; any kind
> >> > of information can be stored in those first four blocks and the mx23
> >> > bootrom ignores it, so what's the gain of this?
> >> 
> >> Well, it works fine for users. A good gain in my opinion.
> > 
> > How is a simple documented dd if=... different? It's the same on imx, you
> > have to dd u-boot.imx with some offset.
> > 
> >> > I wonder, will MX28 bootrom ignore them as well? Then maybe we can get
> >> > rid of all this SD-specific junk.
> >> 
> >> Did not test but MX28 expects a BCB data structure (as said in 12.11.2
> >> - MX28RM) while MX23 does not. So I think MX28 won't work without the
> >> BCB.
> > 
> > Fabio?
> > 
> >> > Furthermore, I'd like to see all of this reworked as another plugin
> >> > for mkimage.
> >> 
> >> Yes; it would be a good long term solution but I don't want to hold it
> >> due any of above reasons. It works fine so improvements can be done
> >> later.
> > 
> > We already have a solution:
> > 
> > dd if=u-boot.sb of=/dev/sdX1 bs=512 seek=4
> > 
> > I think this is enough for now, until all is fixed in proper sequence.
> > That is, NAND driver and only after that, mxsboot for NAND _and_ SD .
> > For now, let's hold off this patch, add the above dd stuff into
> > documentation (doc/README.mx23) and then when all is ready, fix it all
> > properly please.
> 
> Well; you blocked olinuxino patch until mxsboot where ported and the
> dd with offset were not a solution for you, ... so ...

So, Fabio, can you please explain this to me? How does the SD boot work on mx23?

Does the inlined patch work on MX23 and MX28? We can use that as a temporary 
workaround.

> I prefer to have this as is and share documentation with mx28. The
> NAND ought to be done providing same interface so one doc for it all.
> I think change it in next version is wrong and confuse users.

Make a doc/README.mx23 with quirks needed for MX23. Once the issues are ironed 
out, adjust the readme. No problem.

PATCH:
diff --git a/tools/mxsboot.c b/tools/mxsboot.c
index 6c05aa4..d92c39f 100644
--- a/tools/mxsboot.c
+++ b/tools/mxsboot.c
@@ -551,7 +551,7 @@ static int mx28_create_sd_image(int infd, int outfd)
 
        fsize = lseek(infd, 0, SEEK_END);
        lseek(infd, 0, SEEK_SET);
-       size = fsize + 512;
+       size = fsize + 4 * 512;
 
        buf = malloc(size);
        if (!buf) {
@@ -559,7 +559,7 @@ static int mx28_create_sd_image(int infd, int outfd)
                goto err0;
        }
 
-       ret = read(infd, (uint8_t *)buf + 512, fsize);
+       ret = read(infd, (uint8_t *)buf + 4 * 512, fsize);
        if (ret != fsize) {
                ret = -1;
                goto err1;
@@ -574,8 +574,8 @@ static int mx28_create_sd_image(int infd, int outfd)
        cb->drv_info[0].chip_num = 0x0;
        cb->drv_info[0].drive_type = 0x0;
        cb->drv_info[0].tag = 0x1;
-       cb->drv_info[0].first_sector_number = sd_sector + 1;
-       cb->drv_info[0].sector_count = (size - 1) / 512;
+       cb->drv_info[0].first_sector_number = sd_sector + 4;
+       cb->drv_info[0].sector_count = (size - 4) / 512;
 
        wr_size = write(outfd, buf, size);
        if (wr_size != size) {

Best regards,
Marek Vasut