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rk27generic: expose the NAND as a drive

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The NAND holds two volumes, SYS and USER; the split is recorded in the
boot area, so they are separate drives rather than partitions of one.
SYS is hidden: nothing in it is the user's, and deleting or overfilling
it stops the device booting. HAVE_RK27XX_NAND_SYS, documented in the
config and off, brings it back as a drive of its own.

storage.c numbers drives by driver, SD first:

                 default          HAVE_RK27XX_NAND_SYS
   drive 0       SD               SD
   drive 1       NAND USER        NAND SYS
   drive 2                        NAND USER

NUM_DRIVES was 1, which was already wrong for a target whose
CONFIG_STORAGE names both SD and NAND.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Change-Id: Ic68921838faef0ff6fd296d43e86ec3a10a091c5
This commit is contained in:
Marcin Bukat 2026-09-23 19:03:59 +02:00
parent a0c1085f3f
commit 0db035d231
1 changed files with 25 additions and 1 deletions
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26
firmware/export/config/rk27generic.h
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@ -56,7 +56,6 @@
#define HAVE_FLASH_STORAGE
#define CONFIG_STORAGE (STORAGE_SD | STORAGE_NAND)
#define NUM_DRIVES 1 /* NAND doesn't work yet */
#define CONFIG_NAND NAND_RK27XX
#define HAVE_SW_TONE_CONTROLS
@ -64,6 +63,31 @@
/* commented for now */
/* #define HAVE_HOTSWAP */
/* The NAND holds two volumes (ftl-scheme-a.c): SYS, ~94 MB, where the
* original firmware keeps itself - on a Rockbox device that includes the
* BASE.RKW that chainloads the Rockbox bootloader - and USER, the rest of the
* chip. The split is recorded in the boot area, so they are separate drives
* rather than partitions of one.
*
* SYS is hidden: nothing in it is the user's, and deleting or overfilling it
* stops the device booting. Define HAVE_RK27XX_NAND_SYS - here, or in a
* purpose build - to present it as a drive of its own, readable and, with
* FTL_ALLOW_WRITE, writable like USER.
*
* storage.c numbers drives by driver, SD first:
*
* default HAVE_RK27XX_NAND_SYS
* drive 0 SD SD
* drive 1 NAND USER NAND SYS
* drive 2 NAND USER
*/
/* #define HAVE_RK27XX_NAND_SYS */
#ifdef HAVE_RK27XX_NAND_SYS
#define NUM_DRIVES 3
#else
#define NUM_DRIVES 2
#endif
#define SECTOR_SIZE 512
/* for small(ish) SD cards */