[U-Boot] [PATCH] NAND: Allow nand_ids and nand_bbt to be compiled in SPL

[Mike Frysinger <vapier@gentoo.org>]

On Wednesday 04 January 2012 18:56:23 Scott Wood wrote:
> On 12/05/2011 05:17 PM, Marek Vasut wrote:
> > This will be beneficial for the PXA3XX NAND driver, which uses the NAND
> > IDs to identify the chip and configure the controller accordingly.
> > 
> > --- a/drivers/mtd/nand/Makefile
> > +++ b/drivers/mtd/nand/Makefile
> > 
> >  endif
> >  else
> >  COBJS-y += nand.o
> > -COBJS-y += nand_bbt.o
> > -COBJS-y += nand_ids.o
> >  COBJS-y += nand_util.o
> >  endif
> > +COBJS-y += nand_bbt.o
> > +COBJS-y += nand_ids.o
> >  COBJS-y += nand_ecc.o
> >  COBJS-y += nand_base.o
> 
> So, in theory with gc-sections this shouldn't increase the size of any
> SPL that currently successfully links (at least in the absence of things
> like weak symbols).  However, I observed a devkit8000 build go from this:
> 
>    text    data     bss     dec     hex filename
>   40709    1792  197764  240265   3aa89 /tmp/u-boot-arm/spl/u-boot-spl
> 
> to this:
> 
>    text    data     bss     dec     hex filename
>   42277    1792  197764  241833   3b0a9 /tmp/u-boot-arm/spl/u-boot-spl
> 
> I verified that --function-sections/-fdata-sections/--gc-sections are
> being used on the SPL.  It looks like strings are not getting dropped.

specifically, "anonymous" strings (or whatever the term is).  it could be made 
to work, but it'd be ugly.  something like:

--- a/drivers/mtd/nand/nand_ids.c
+++ b/drivers/mtd/nand/nand_ids.c
@@ -22,6 +22,12 @@
 +	256	256 Byte page size
 *	512	512 Byte page size
 */
+
+static const char nand_16mib_18v_8bit[] = "NAND 16MiB 1,8V 8-bit";
+static const char nand_16mib_33v_8bit[] = "NAND 16MiB 3,3V 8-bit";
+static const char nand_16mib_18v_16bit[] = "NAND 16MiB 1,8V 16-bit";
+static const char nand_16mib_33v_16bit[] = "NAND 16MiB 3,3V 16-bit";
+
 const struct nand_flash_dev nand_flash_ids[] = {
 
 #ifdef CONFIG_MTD_NAND_MUSEUM_IDS
@@ -42,10 +48,10 @@
 	{"NAND 8MiB 3,3V 16-bit",	0x59, 512, 8, 0x2000, NAND_BUSWIDTH_16},
 #endif
 
-	{"NAND 16MiB 1,8V 8-bit",	0x33, 512, 16, 0x4000, 0},
-	{"NAND 16MiB 3,3V 8-bit",	0x73, 512, 16, 0x4000, 0},
-	{"NAND 16MiB 1,8V 16-bit",	0x43, 512, 16, 0x4000, NAND_BUSWIDTH_16},
-	{"NAND 16MiB 3,3V 16-bit",	0x53, 512, 16, 0x4000, NAND_BUSWIDTH_16},
+	{nand_16mib_18v_8bit,	0x33, 512, 16, 0x4000, 0},
+	{nand_16mib_33v_8bit,	0x73, 512, 16, 0x4000, 0},
+	{nand_16mib_18v_16bit,	0x43, 512, 16, 0x4000, NAND_BUSWIDTH_16},
+	{nand_16mib_33v_16bit,	0x53, 512, 16, 0x4000, NAND_BUSWIDTH_16},
 
 	{"NAND 32MiB 1,8V 8-bit",	0x35, 512, 32, 0x4000, 0},
 	{"NAND 32MiB 3,3V 8-bit",	0x75, 512, 32, 0x4000, 0},
-mike
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