Hello,
Am 20.12.2010 07:07, schrieb John Rigby:
With your patch and the following hack nand works:
diff --git a/drivers/mtd/nand/omap_gpmc.c b/drivers/mtd/nand/omap_gpmc.c index 99b9cef..5e94155 100644 --- a/drivers/mtd/nand/omap_gpmc.c +++ b/drivers/mtd/nand/omap_gpmc.c @@ -29,6 +29,8 @@ #include<linux/mtd/nand_ecc.h> #include<nand.h>
+#define origwriteb(v,a) __arch_putb(v,a)
- static uint8_t cs; static struct nand_ecclayout hw_nand_oob = GPMC_NAND_HW_ECC_LAYOUT;
@@ -58,7 +60,7 @@ static void omap_nand_hwcontrol(struct mtd_info *mtd, int32_t cmd, }
if (cmd != NAND_CMD_NONE)
writeb(cmd, this->IO_ADDR_W);
origwriteb(cmd, this->IO_ADDR_W);}
/*
The working assembly looks like this:
if (cmd != NAND_CMD_NONE) 80024d28: e3710001 cmn r1, #1 origwriteb(cmd, this->IO_ADDR_W); 80024d2c: 15933004 ldrne r3, [r3, #4] 80024d30: 120110ff andne r1, r1, #255 ; 0xff 80024d34: 15c31000 strbne r1, [r3] 80024d38: e8bd8010 pop {r4, pc}
The broken assembly looks like this:
if (cmd != NAND_CMD_NONE) 80024d28: e3710001 cmn r1, #1 80024d2c: 08bd8010 popeq {r4, pc} writeb(cmd, this->IO_ADDR_W); 80024d30: e5933004 ldr r3, [r3, #4] 80024d34: e20110ff and r1, r1, #255 ; 0xff 80024d38: e5c31000 strb r1, [r3] 80024d3c: e5d33000 ldrb r3, [r3] 80024d40: e8bd8010 pop {r4, pc}
This is with gcc version "(Ubuntu/Linaro 4.4.4-14ubuntu4) 4.4.5". I'll try a 4.5.2 version next and see what happens.
There must be more problems. Using gcc 4.5.1, the read*/write*-patch and your hack, my kernel doesn't boot. Using gcc 4.3.5 and the same source to compile u-boot the kernel comes up. Here is the output for the non-working u-boot:
---------------- U-Boot 2010.12-rc3-00015-g3ae9687-dirty (Dec 20 2010 - 18:01:41, gcc 4.5.1)
OMAP3530-GP ES3.1, CPU-OPP2, L3-165MHz, Max CPU Clock 720 mHz OMAP3 Beagle board + LPDDR/NAND I2C: ready DRAM: 256 MiB NAND: 256 MiB MMC: OMAP SD/MMC: 0 In: serial Out: serial Err: serial Beagle Rev C4 timed out in wait_for_pin: I2C_STAT=0 No EEPROM on expansion board Die ID #062a000400000000040365fa16019019 Hit any key to stop autoboot: 0 reading boot.scr
422 bytes read Running bootscript from mmc ... ## Executing script at 82000000 reading uImage
2419940 bytes read Booting from mmc ... ## Booting kernel from Legacy Image at 82000000 ... Image Name: Linux-2.6.37-rc5-beagleboard-000 Image Type: ARM Linux Kernel Image (uncompressed) Data Size: 2419876 Bytes = 2.3 MiB Load Address: 80008000 Entry Point: 80008000 Verifying Checksum ... OK Loading Kernel Image ... OK OK ----------------
Nothing else.
Regards,
Alexander