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allow client apps to disable the safety check that normally prevents you

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from overwriting boot1/boot2, using an IPC call. use with caution,
see comments in source code.
This commit is contained in:
bushing 2010-04-07 03:21:20 -07:00
parent 4a13e2d207
commit ec1e5b7687
3 changed files with 25 additions and 8 deletions
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2
ipc.c
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@ -30,7 +30,7 @@ Copyright (C) 2009 John Kelley <wiidev@kelley.ca>
#include "panic.h"
#define MINI_VERSION_MAJOR 1
#define MINI_VERSION_MINOR 2
#define MINI_VERSION_MINOR 3
static volatile ipc_request in_queue[IPC_IN_SIZE] ALIGNED(32) MEM2_BSS;
static volatile ipc_request out_queue[IPC_OUT_SIZE] ALIGNED(32) MEM2_BSS;

2
ipc.h
View File

@ -72,6 +72,8 @@ Copyright (C) 2009 John Kelley <wiidev@kelley.ca>
#define IPC_NAND_WRITE 0x0003
#define IPC_NAND_ERASE 0x0004
#define IPC_NAND_STATUS 0x0005
#define IPC_NAND_SETMINPAGE 0x0006
#define IPC_NAND_GETMINPAGE 0x0007
//#define IPC_NAND_USER0 0x8000
//#define IPC_NAND_USER1 0x8001
// etc.

29
nand.c
View File

@ -25,11 +25,6 @@ Copyright (C) 2008, 2009 Hector Martin "marcan" <marcan@marcansoft.com>
// #define NAND_DEBUG 1
#define NAND_SUPPORT_WRITE 1
#define NAND_SUPPORT_ERASE 1
#ifdef ALLOW_BOOT2_WRITES
#define NAND_MIN_PAGE 0x40
#else
#define NAND_MIN_PAGE 0x200
#endif
#ifdef NAND_DEBUG
# include "gecko.h"
@ -64,6 +59,7 @@ static u8 ipc_ecc[ECC_BUFFER_ALLOC] MEM2_BSS ALIGNED(128); //128 alignment REQUI
static volatile int irq_flag;
static u32 last_page_read = 0;
static u32 nand_min_page = 0x200; // default to protecting boot1+boot2
void nand_irq(void)
{
@ -211,7 +207,7 @@ void nand_write_page(u32 pageno, void *data, void *ecc) {
NAND_debug("nand_write_page(%u, %p, %p)\n", pageno, data, ecc);
// this is a safety check to prevent you from accidentally wiping out boot1 or boot2.
if ((pageno < NAND_MIN_PAGE) || (pageno >= NAND_MAX_PAGE)) {
if ((pageno < nand_min_page) || (pageno >= NAND_MAX_PAGE)) {
gecko_printf("Error: nand_write to page %d forbidden\n", pageno);
return;
}
@ -232,7 +228,7 @@ void nand_erase_block(u32 pageno) {
NAND_debug("nand_erase_block(%d)\n", pageno);
// this is a safety check to prevent you from accidentally wiping out boot1 or boot2.
if ((pageno < NAND_MIN_PAGE) || (pageno >= NAND_MAX_PAGE)) {
if ((pageno < nand_min_page) || (pageno >= NAND_MAX_PAGE)) {
gecko_printf("Error: nand_erase to page %d forbidden\n", pageno);
return;
}
@ -296,6 +292,7 @@ int nand_correct(u32 pageno, void *data, void *ecc)
void nand_ipc(volatile ipc_request *req)
{
u32 new_min_page = 0x200;
if (current_request.code != 0) {
gecko_printf("NAND: previous IPC request is not done yet.");
ipc_post(req->code, req->tag, 1, -1);
@ -337,6 +334,24 @@ void nand_ipc(volatile ipc_request *req)
nand_erase_block(req->args[0]);
break;
#endif
/* This is only here to support the truly brave or stupid who are using hardware hacks to reflash
boot1/boot2 onto blank or corrupted NAND flash chips. Best practices dictate that you should
query minpage (and make sure it is the value you expect -- usually 0x200) before writing to NAND.
If you call SETMINPAGE, you MUST then call GETMINPAGE to check that it actually succeeded, do your
writes, and then as soon as possible call SETMINPAGE(0x200) to restore the default minimum page. */
case IPC_NAND_SETMINPAGE:
new_min_page = req->args[0];
if (new_min_page > 0x200) {
gecko_printf("Ignoring strange NAND_SETMINPAGE request: %u\n", new_min_page);
break;
}
gecko_printf("WARNING: setting minimum allowed NAND page to %u\n", new_min_page);
nand_min_page = new_min_page;
ipc_post(req->code, req->tag, 0);
break;
case IPC_NAND_GETMINPAGE:
ipc_post(req->code, req->tag, 1, nand_min_page);
break;
default:
gecko_printf("IPC: unknown SLOW NAND request %04x\n",
req->req);