Dear Wolfgang,
I had been working on creating an MMC SPL for OMAP4. OMAP boards typically support booting from the FAT partition of a removable SD/MMC card. So, we need to have FAT support in the SPL. But I am having some difficulties in adding FAT support to SPL.
BSS footprint of fat.c is very high. It has three buffers each of size 64KB. To workaround this problem I have done something like below(The way x-loader works around this problem today). CONFIG_SYS_SPL_FAT_BUFFER_BASE is in SDRAM.Is this ok?
Also, I was wondering why we need 3 such scratch buffers in this implementation. I do not understand this code. But I was wondering if we could work with just one 64K buffer?
--- +#ifdef CONFIG_PRELOADER +__u8 *get_vfatname_block = (__u8 *)CONFIG_SYS_SPL_FAT_BUFFER_BASE; +#else __attribute__ ((__aligned__ (__alignof__ (dir_entry)))) __u8 get_vfatname_block[MAX_CLUSTSIZE]; +#endif
. . .
+#ifdef CONFIG_PRELOADER +__u8 *get_dentfromdir_block = (__u8 *)CONFIG_SYS_SPL_FAT_BUFFER_BASE + + MAX_CLUSTSIZE; +#else __attribute__ ((__aligned__ (__alignof__ (dir_entry)))) __u8 get_dentfromdir_block[MAX_CLUSTSIZE]; +#endif +
Best regards, Aneesh